diff --git a/Makefile b/Makefile
index 2350bff738739..9ce15c7d2a358 100644
--- a/Makefile
+++ b/Makefile
@@ -136,9 +136,12 @@ d3.geom.js: \
 tests: \
 	tests/test-append.test \
 	tests/test-attr.test \
+	tests/test-call.test \
 	tests/test-format.test \
 	tests/test-transition.test \
-	tests/test-scale-linear.test
+	tests/test-scale-linear.test \
+	tests/test-scale-sqrt.test \
+	tests/test-scale-pow.test
 
 %.min.js: %.js Makefile
 	@rm -f $@
diff --git a/d3.geo.min.js b/d3.geo.min.js
index b63b76cbf575b..2f664135333f2 100644
--- a/d3.geo.min.js
+++ b/d3.geo.min.js
@@ -1,5 +1,5 @@
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index bb8b24354f885..c5a56fbdc8355 100644
--- a/d3.geom.min.js
+++ b/d3.geom.min.js
@@ -1,15 +1,15 @@
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+m.a;if(Math.abs(r)<1.0E-10)return null;var u=(j.c*m.b-m.c*j.b)/r;r=(m.c*j.a-j.c*m.a)/r;var w=j.region.r,y=m.region.r;if(w.y<y.y||w.y==y.y&&w.x<y.x)w=h;else{w=i;j=m}if((j=u>=j.region.r.x)&&w.side=="l"||!j&&w.side=="r")return null;return{x:u,y:r}},rightOf:function(h,i){var j=h.edge,m=j.region.r,r=i.x>m.x;if(r&&h.side=="l")return 1;if(!r&&h.side=="r")return 0;if(j.a==1){var u=i.y-m.y,w=i.x-m.x,y=0,x=0;if(!r&&j.b<0||r&&j.b>=0)x=y=u>=j.b*w;else{x=i.x+i.y*j.b>j.c;if(j.b<0)x=!x;x||(y=1)}if(!y){m=m.x-j.region.l.x;
+x=j.b*(w*w-u*u)<m*u*(1+2*w/m+j.b*j.b);if(j.b<0)x=!x}}else{w=j.c-j.a*i.x;j=i.y-w;u=i.x-m.x;m=w-m.y;x=j*j>u*u+m*m}return h.side=="l"?x:!x},endPoint:function(h,i,j){h.ep[i]=j;h.ep[B[i]]&&g(h)},distance:function(h,i){var j=h.x-i.x,m=h.y-i.y;return Math.sqrt(j*j+m*m)}},b={list:[],insert:function(h,i,j){h.vertex=i;h.ystar=i.y+j;j=0;for(var m=b.list,r=m.length;j<r;j++){var u=m[j];if(!(h.ystar>u.ystar||h.ystar==u.ystar&&i.x>u.vertex.x))break}m.splice(j,0,h)},del:function(h){for(var i=0,j=b.list,m=j.length;i<
+m&&j[i]!=h;++i);j.splice(i,1)},empty:function(){return b.list.length==0},nextEvent:function(h){for(var i=0,j=b.list,m=j.length;i<m;++i)if(j[i]==h)return j[i+1];return null},min:function(){var h=b.list[0];return{x:h.vertex.x,y:h.ystar}},extractMin:function(){return b.list.shift()}};a.init();d.bottomSite=d.list.shift();for(var e=d.list.shift(),l,k,o,p,s,n,t,q,v;;){b.empty()||(l=b.min());if(e&&(b.empty()||e.y<l.y||e.y==l.y&&e.x<l.x)){k=a.leftBound(e);o=a.right(k);t=a.rightRegion(k);v=f.bisect(t,e);n=
+a.createHalfEdge(v,"l");a.insert(k,n);if(q=f.intersect(k,n)){b.del(k);b.insert(k,q,f.distance(q,e))}k=n;n=a.createHalfEdge(v,"r");a.insert(k,n);(q=f.intersect(n,o))&&b.insert(n,q,f.distance(q,e));e=d.list.shift()}else if(b.empty())break;else{k=b.extractMin();p=a.left(k);o=a.right(k);s=a.right(o);t=a.leftRegion(k);n=a.rightRegion(o);q=k.vertex;f.endPoint(k.edge,k.side,q);f.endPoint(o.edge,o.side,q);a.del(k);b.del(o);a.del(o);k="l";if(t.y>n.y){k=t;t=n;n=k;k="r"}v=f.bisect(t,n);n=a.createHalfEdge(v,
+k);a.insert(p,n);f.endPoint(v,B[k],q);if(q=f.intersect(p,n)){b.del(p);b.insert(p,q,f.distance(q,t))}(q=f.intersect(n,s))&&b.insert(n,q,f.distance(q,t))}}for(k=a.right(a.leftEnd);k!=a.rightEnd;k=a.right(k))g(k.edge)}function z(c,g,d,a,f,b){if(!c(g,d,a,f,b)){var e=(d+f)*0.5,l=(a+b)*0.5;g=g.nodes;g[0]&&z(c,g[0],d,a,e,l);g[1]&&z(c,g[1],e,a,f,l);g[2]&&z(c,g[2],d,l,e,b);g[3]&&z(c,g[3],e,l,f,b)}}d3.geom={};d3.geom.contour=function(c,g){var d;if(!(d=g))a:{for(var a=d=0;;){if(c(d,a)){d=[d,a];break a}if(d==
+0){d=a+1;a=0}else{d-=1;a+=1}}d=void 0}a=[];var f=d[0],b=d[1],e=0,l=0,k=NaN,o=NaN;l=0;do{l=0;if(c(f-1,b-1))l+=1;if(c(f,b-1))l+=2;if(c(f-1,b))l+=4;if(c(f,b))l+=8;if(l==6){e=o==-1?-1:1;l=0}else if(l==9){e=0;l=k==1?-1:1}else{e=F[l];l=G[l]}if(e!=k&&l!=o){a.push([f,b]);k=e;o=l}f+=e;b+=l}while(d[0]!=f||d[1]!=b);return a};var F=[1,0,1,1,-1,0,-1,1,0,0,0,0,-1,0,-1,NaN],G=[0,-1,0,0,0,-1,0,0,1,-1,1,1,0,-1,0,NaN];d3.geom.hull=function(c){if(c.length<3)return[];var g=c.length,d=g-1,a=[],f=[],b,e=0,l,k,o,p,s,n,
+t;for(b=1;b<g;++b)if(c[b][1]<c[e][1])e=b;else if(c[b][1]==c[e][1])e=c[b][0]<c[e][0]?b:e;for(b=0;b<g;++b)if(b!=e){k=c[b][1]-c[e][1];l=c[b][0]-c[e][0];a.push({angle:Math.atan2(k,l),index:b})}a.sort(function(q,v){return q.angle-v.angle});t=a[0].angle;n=a[0].index;s=0;for(b=1;b<d;++b){g=a[b].index;if(t==a[b].angle){l=c[n][0]-c[e][0];k=c[n][1]-c[e][1];o=c[g][0]-c[e][0];p=c[g][1]-c[e][1];if(l*l+k*k>=o*o+p*p)a[b].index=-1;else{a[s].index=-1;t=a[b].angle;s=b;n=g}}else{t=a[b].angle;s=b;n=g}}f.push(e);for(g=
+b=0;b<2;++g)if(a[g].index!=-1){f.push(a[g].index);b++}for(e=f.length;g<d;++g)if(a[g].index!=-1){for(;!E(f[e-2],f[e-1],a[g].index,c);)--e;f[e++]=a[g].index}d=[];for(b=0;b<e;++b)d.push(c[f[b]]);return d};d3.geom.polygon=function(c){c.area=function(){for(var g=0,d=c.length,a=c[d-1][0]*c[0][1],f=c[d-1][1]*c[0][0];++g<d;){a+=c[g-1][0]*c[g][1];f+=c[g-1][1]*c[g][0]}return(f-a)*0.5};c.centroid=function(g){var d=-1,a=c.length-1,f=0,b=0,e,l,k;for(arguments.length||(g=1/(6*c.area()));++d<a;){e=c[d];l=c[d+1];
+k=e[0]*l[1]-l[0]*e[1];f+=(e[0]+l[0])*k;b+=(e[1]+l[1])*k}return[f*g,b*g]};c.clip=function(g){for(var d,a=-1,f=c.length,b,e,l=c[f-1],k,o,p;++a<f;){d=g.slice();g.length=0;k=c[a];o=d[(e=d.length)-1];for(b=-1;++b<e;){p=d[b];if(A(p,l,k)){A(o,l,k)||g.push(C(o,p,l,k));g.push(p)}else A(o,l,k)&&g.push(C(o,p,l,k));o=p}l=k}return g};return c};d3.geom.voronoi=function(c){var g=c.map(function(){return[]});D(c,function(d){var a,f,b,e;if(d.a==1&&d.b>=0){a=d.ep.r;f=d.ep.l}else{a=d.ep.l;f=d.ep.r}if(d.a==1){b=a?a.y:
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+g.forEach(function(a,f){var b=c[f],e=b[0],l=b[1];a.forEach(function(p){p.angle=Math.atan2(p[0]-e,p[1]-l)});a.sort(function(p,s){return p.angle-s.angle});for(var k=0,o=a.length-1;k<o;k++)d.push([b,a[k],a[k+1]])});return d};d3.geom.quadtree=function(c){function g(s,n,t,q,v,h){if(!(isNaN(n[0])||isNaN(n[1])))if(s.leaf){var i=s.point;if(i){if(!(Math.abs(i[0]-n[0])+Math.abs(i[1]-n[1])<0.01)){s.point=null;d(s,i,t,q,v,h)}d(s,n,t,q,v,h)}else s.point=n}else d(s,n,t,q,v,h)}function d(s,n,t,q,v,h){var i=(t+v)*
+0.5,j=(q+h)*0.5,m=n[0]>=i,r=n[1]>=j,u=(r<<1)+m;s.leaf=false;s=s.nodes[u]||(s.nodes[u]={leaf:true,nodes:[],point:null});if(m)t=i;else v=i;if(r)q=j;else h=j;g(s,n,t,q,v,h)}for(var a,f=-1,b=c.length,e=Number.POSITIVE_INFINITY,l=e,k=Number.NEGATIVE_INFINITY,o=k;++f<b;){a=c[f];if(a[0]<e)e=a[0];if(a[1]<l)l=a[1];if(a[0]>k)k=a[0];if(a[1]>o)o=a[1]}a=k-e;f=o-l;if(a>f)o=l+a;else k=e+f;var p={leaf:true,nodes:[],point:null};for(f=-1;++f<b;)g(p,c[f],e,l,k,o);p.visit=function(s){z(s,p,e,l,k,o)};return p}})();
diff --git a/d3.js b/d3.js
index 7425ee9df0d3d..e8bace7add78d 100644
--- a/d3.js
+++ b/d3.js
@@ -1,4 +1,4 @@
-(function(){d3 = {version: "1.6.0"}; // semver
+(function(){d3 = {version: "1.6.1"}; // semver
 if (!Date.now) Date.now = function() {
   return +new Date();
 };
@@ -195,10 +195,19 @@ function d3_splitter(d) {
 function d3_collapse(s) {
   return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
 }
+//
+// Note: assigning to the arguments array simultaneously changes the value of
+// the corresponding argument! However, the Google Closure compiler doesn't
+// realize this, and so can optimize-away our attempt to avoid side-effects.
+// This fix by Jason Davies has been tested to survive minimization.
+//
+// TODO The `this` argument probably shouldn't be the first argument to the
+// callback, anyway, since it's redundant. However, that will require a major
+// version bump due to backwards compatibility, so I'm not changing it right
+// away.
+//
 function d3_call(callback) {
-  var f = callback;
-  arguments[0] = this;
-  f.apply(this, arguments);
+  callback.apply(this, (arguments[0] = this, arguments));
   return this;
 }
 /**
@@ -2086,17 +2095,9 @@ d3.scale.log = function() {
 d3.scale.pow = function() {
   var linear = d3.scale.linear(),
       tick = d3.scale.linear(), // TODO better tick formatting...
-      p = 1,
-      b = 1 / p,
-      n = false;
-
-  function powp(x) {
-    return n ? -Math.pow(-x, p) : Math.pow(x, p);
-  }
-
-  function powb(x) {
-    return n ? -Math.pow(-x, b) : Math.pow(x, b);
-  }
+      exponent = 1,
+      powp = Number,
+      powb = powp;
 
   function scale(x) {
     return linear(powp(x));
@@ -2108,7 +2109,9 @@ d3.scale.pow = function() {
 
   scale.domain = function(x) {
     if (!arguments.length) return linear.domain().map(powb);
-    n = (x[0] || x[1]) < 0;
+    var pow = (x[0] || x[1]) < 0 ? d3_scale_pown : d3_scale_pow;
+    powp = pow(exponent);
+    powb = pow(1 / exponent);
     linear.domain(x.map(powp));
     tick.domain(x);
     return scale;
@@ -2116,20 +2119,31 @@ d3.scale.pow = function() {
 
   scale.range = d3_rebind(scale, linear.range);
   scale.rangeRound = d3_rebind(scale, linear.rangeRound);
-  scale.inteprolate = d3_rebind(scale, linear.interpolate);
+  scale.interpolate = d3_rebind(scale, linear.interpolate);
   scale.ticks = tick.ticks;
   scale.tickFormat = tick.tickFormat;
 
   scale.exponent = function(x) {
-    if (!arguments.length) return p;
+    if (!arguments.length) return exponent;
     var domain = scale.domain();
-    p = x;
-    b = 1 / x;
+    exponent = x;
     return scale.domain(domain);
   };
 
   return scale;
 };
+
+function d3_scale_pow(e) {
+  return function(x) {
+    return Math.pow(x, e);
+  };
+}
+
+function d3_scale_pown(e) {
+  return function(x) {
+    return -Math.pow(-x, e);
+  };
+}
 d3.scale.sqrt = function() {
   return d3.scale.pow().exponent(.5);
 };
diff --git a/d3.min.js b/d3.min.js
index b2977124c77cd..d7ff6ca7973ac 100644
--- a/d3.min.js
+++ b/d3.min.js
@@ -1,4 +1,4 @@
-(function(){function xa(a){for(var b=-1,d=a.length,g=[];++b<d;)g.push(a[b]);return g}function v(a){return typeof a=="function"?a:function(){return a}}function C(a,b){return function(){var d=b.apply(a,arguments);return arguments.length?a:d}}function ya(a){return a==null}function da(a){return a.replace(/(^\s+)|(\s+$)/g,"").replace(/\s+/g," ")}function ea(a){arguments[0]=this;a.apply(this,arguments);return this}function za(){var a={},b=[];a.add=function(d){for(var g=0;g<b.length;g++)if(b[g].listener==
+(function(){function xa(a){for(var b=-1,d=a.length,g=[];++b<d;)g.push(a[b]);return g}function v(a){return typeof a=="function"?a:function(){return a}}function C(a,b){return function(){var d=b.apply(a,arguments);return arguments.length?a:d}}function ya(a){return a==null}function da(a){return a.replace(/(^\s+)|(\s+$)/g,"").replace(/\s+/g," ")}function ea(a){a.apply(this,(arguments[0]=this,arguments));return this}function za(){var a={},b=[];a.add=function(d){for(var g=0;g<b.length;g++)if(b[g].listener==
 d)return a;b.push({listener:d,on:true});return a};a.remove=function(d){for(var g=0;g<b.length;g++){var e=b[g];if(e.listener==d){e.on=false;b=b.slice(0,g).concat(b.slice(g+1));break}}return a};a.dispatch=function(){for(var d=b,g=0,e=d.length;g<e;g++){var c=d[g];c.on&&c.listener.apply(this,arguments)}};return a}function fa(a){for(var b=a.lastIndexOf("."),d=b>=0?a.substring(b):(b=a.length,""),g=[];b>0;)g.push(a.substring(b-=3,b+3));return g.reverse().join(",")+d}function ga(a){return function(b){return 1-
 a(1-b)}}function ha(a){return function(b){return 0.5*(b<0.5?a(2*b):2-a(2-2*b))}}function Aa(a){return a}function R(a){return function(b){return Math.pow(b,a)}}function Ba(a){return 1-Math.cos(a*Math.PI/2)}function Ca(a){return a?Math.pow(2,10*(a-1))-0.0010:0}function Da(a){return 1-Math.sqrt(1-a*a)}function Ea(a){return a<1/2.75?7.5625*a*a:a<2/2.75?7.5625*(a-=1.5/2.75)*a+0.75:a<2.5/2.75?7.5625*(a-=2.25/2.75)*a+0.9375:7.5625*(a-=2.625/2.75)*a+0.984375}function J(a,b,d){return{r:a,g:b,b:d,toString:Fa}}
 function Fa(){return"#"+S(this.r)+S(this.g)+S(this.b)}function S(a){return a<16?"0"+a.toString(16):a.toString(16)}function T(a,b,d){var g=0,e=0,c=0,f,h;if(f=/([a-z]+)\((.*)\)/i.exec(a)){h=f[2].split(",");switch(f[1]){case "hsl":return d(parseFloat(h[0]),parseFloat(h[1])/100,parseFloat(h[2])/100);case "rgb":return b(U(h[0]),U(h[1]),U(h[2]))}}if(d=G[a])return b(d.r,d.g,d.b);if(a!=null&&a.charAt(0)=="#"){if(a.length==4){g=a.charAt(1);g+=g;e=a.charAt(2);e+=e;c=a.charAt(3);c+=c}else if(a.length==7){g=
@@ -22,48 +22,48 @@ for(u in e)s[u]=e[u].apply(this,arguments)}t=p(q);for(u in e)s[u].call(this,t);i
 u(s))}}function q(r,t){var u=n.call(this,r,t,this.getAttributeNS(m.space,m.local));return function(s){this.setAttributeNS(m.space,m.local,u(s))}}e["attr."+m]=m.local?q:l;return d};d.attr=function(m,n){return d.attrTween(m,ka(n))};d.styleTween=function(m,n,l){if(arguments.length<3)l=null;e["style."+m]=function(q,r){var t=n.call(this,q,r,window.getComputedStyle(this,null).getPropertyValue(m));return function(u){this.style.setProperty(m,t(u),l)}};return d};d.style=function(m,n,l){if(arguments.length<
 3)l=null;return d.styleTween(m,ka(n),l)};d.select=function(m){var n;m=X(a.select(m)).ease(p);n=-1;m.delay(function(){return k[++n]});n=-1;m.duration(function(){return j[++n]});return m};d.selectAll=function(m){var n;m=X(a.selectAll(m)).ease(p);n=-1;m.delay(function(l,q){return k[q?n:++n]});n=-1;m.duration(function(l,q){return j[q?n:++n]});return m};d.remove=function(){f=true;return d};d.each=function(m,n){h[m].add(n);return d};d.call=ea;return d.delay(0).duration(250)}function ka(a){return typeof a==
 "function"?function(b,d,g){return d3.interpolate(g,String(a.call(this,b,d)))}:(a=String(a),function(b,d,g){return d3.interpolate(g,a)})}function ja(a,b){var d=Date.now(),g=false,e=d+b,c=F;if(isFinite(b)){for(;c;){if(c.callback==a){c.then=d;c.delay=b;g=true}else{var f=c.then+c.delay;if(f<e)e=f}c=c.next}g||(F={callback:a,then:d,delay:b,next:F});if(!K){clearTimeout(Z);Z=setTimeout(La,Math.max(24,e-d))}}}function La(){K=1;Z=0;la(ma)}function ma(){for(var a,b=Date.now(),d=F;d;){a=b-d.then;if(a>d.delay)d.flush=
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+-3*a+"Z"},diamond:function(a){a=Math.sqrt(a/(2*wa));var b=a*wa;return"M0,"+-a+"L"+b+",0 0,"+a+" "+-b+",0Z"},square:function(a){a=Math.sqrt(a)/2;return"M"+-a+","+-a+"L"+a+","+-a+" "+a+","+a+" "+-a+","+a+"Z"},"triangle-down":function(a){a=Math.sqrt(a/Q);var b=a*Q/2;return"M0,"+b+"L"+a+","+-b+" "+-a+","+-b+"Z"},"triangle-up":function(a){a=Math.sqrt(a/Q);var b=a*Q/2;return"M0,"+-b+"L"+a+","+b+" "+-a+","+b+"Z"}},Q=Math.sqrt(3),wa=Math.tan(30*Math.PI/180)})();
diff --git a/lib/google-compiler/README b/lib/google-compiler/README
index d3c90e7811a95..dfffa7f93dd02 100644
--- a/lib/google-compiler/README
+++ b/lib/google-compiler/README
@@ -1,5 +1,5 @@
 /*
- * Copyright 2009 Google Inc.
+ * Copyright 2009 The Closure Compiler Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -168,11 +168,11 @@ http://code.google.com/p/jarjar/
 
 -----
 Code in:
-lib/args4j_deploy.jar
+lib/args4j.jar
 
 Args4j
 URL: https://args4j.dev.java.net/
-Version: 2.0.9
+Version: 2.0.12
 License: MIT
 
 Description:
@@ -184,11 +184,11 @@ Local Modifications: None.
 
 -----
 Code in:
-lib/guava-r06.jar
+lib/guava.jar
 
 Guava Libraries
 URL: http://code.google.com/p/guava-libraries/
-Version:  R6
+Version:  R7
 License: Apache License 2.0
 
 Description: Google's core Java libraries.
@@ -196,28 +196,6 @@ Description: Google's core Java libraries.
 Local Modifications: None.
 
 
------
-Code in:
-lib/hamcrest-core-1.1.jar
-
-Hamcrest
-URL: http://code.google.com/p/hamcrest
-License: BSD
-License File: LICENSE
-
-Description:
-Provides a library of matcher objects (also known as constraints or
-predicates) allowing 'match' rules to be defined declaratively, to be used in
-other frameworks. Typical scenarios include testing frameworks, mocking
-libraries and UI validation rules.
-
-Local modifications:
-The original jars contained both source code and compiled classes.
-
-hamcrest-core-1.1.jar just contains the compiled classes.
-
-
-
 -----
 Code in:
 lib/jsr305.jar
@@ -238,7 +216,7 @@ lib/junit.jar
 
 JUnit
 URL:  http://sourceforge.net/projects/junit/
-Version:  4.5
+Version:  4.8.2
 License:  Common Public License 1.0
 
 Description: A framework for writing and running automated tests in Java.
@@ -248,7 +226,7 @@ Local Modifications: None.
 
 ---
 Code in:
-lib/protobuf-java-2.3.0.jar
+lib/protobuf-java.jar
 
 Protocol Buffers
 URL: http://code.google.com/p/protobuf/
@@ -263,27 +241,38 @@ Local Modifications: None
 
 ---
 Code in:
-lib/ant_deploy.jar
+lib/ant.jar
+lib/ant-launcher.jar
 
 URL: http://ant.apache.org/bindownload.cgi
-Version: 1.6.5
+Version: 1.8.1
 License: Apache License 2.0
 Description:
   Ant is a Java based build tool. In theory it is kind of like "make"
   without make's wrinkles and with the full portability of pure java code.
 
-Local Modifications:
-  Modified apache-ant-1.6.5/bin/ant to look in the ant.runfiles directory
+Local Modifications: None
 
 
 ---
 Code in:
 lib/json.jar
 URL: http://json.org/java/index.html
-Version: JSON version 2
+Version: JSON version 20090211
 License: MIT license
 Description:
 JSON is a set of java files for use in transmitting data in JSON format.
 
 Local Modifications: None
 
+---
+Code in:
+tools/maven-ant-tasks-2.1.1.jar
+URL: http://maven.apache.org
+Version 2.1.1
+License: Apache License 2.0
+Description:
+  Maven Ant tasks are used to manage dependencies and to install/deploy to
+  maven repositories.
+
+Local Modifications: None
diff --git a/lib/google-compiler/compiler.jar b/lib/google-compiler/compiler.jar
index 4dfa5ad0b9554..c86a972aef08a 100644
Binary files a/lib/google-compiler/compiler.jar and b/lib/google-compiler/compiler.jar differ
diff --git a/src/core/call.js b/src/core/call.js
index 8c586b8436820..68fae90f84f89 100644
--- a/src/core/call.js
+++ b/src/core/call.js
@@ -1,6 +1,15 @@
+//
+// Note: assigning to the arguments array simultaneously changes the value of
+// the corresponding argument! However, the Google Closure compiler doesn't
+// realize this, and so can optimize-away our attempt to avoid side-effects.
+// This fix by Jason Davies has been tested to survive minimization.
+//
+// TODO The `this` argument probably shouldn't be the first argument to the
+// callback, anyway, since it's redundant. However, that will require a major
+// version bump due to backwards compatibility, so I'm not changing it right
+// away.
+//
 function d3_call(callback) {
-  var f = callback;
-  arguments[0] = this;
-  f.apply(this, arguments);
+  callback.apply(this, (arguments[0] = this, arguments));
   return this;
 }
diff --git a/src/core/core.js b/src/core/core.js
index 9c04e72688744..21704be7c31a3 100644
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -1 +1 @@
-d3 = {version: "1.6.0"}; // semver
+d3 = {version: "1.6.1"}; // semver
diff --git a/src/scale/pow.js b/src/scale/pow.js
index 5826c2d00f6e5..44d59381e9892 100644
--- a/src/scale/pow.js
+++ b/src/scale/pow.js
@@ -1,17 +1,9 @@
 d3.scale.pow = function() {
   var linear = d3.scale.linear(),
       tick = d3.scale.linear(), // TODO better tick formatting...
-      p = 1,
-      b = 1 / p,
-      n = false;
-
-  function powp(x) {
-    return n ? -Math.pow(-x, p) : Math.pow(x, p);
-  }
-
-  function powb(x) {
-    return n ? -Math.pow(-x, b) : Math.pow(x, b);
-  }
+      exponent = 1,
+      powp = Number,
+      powb = powp;
 
   function scale(x) {
     return linear(powp(x));
@@ -23,7 +15,9 @@ d3.scale.pow = function() {
 
   scale.domain = function(x) {
     if (!arguments.length) return linear.domain().map(powb);
-    n = (x[0] || x[1]) < 0;
+    var pow = (x[0] || x[1]) < 0 ? d3_scale_pown : d3_scale_pow;
+    powp = pow(exponent);
+    powb = pow(1 / exponent);
     linear.domain(x.map(powp));
     tick.domain(x);
     return scale;
@@ -31,17 +25,28 @@ d3.scale.pow = function() {
 
   scale.range = d3_rebind(scale, linear.range);
   scale.rangeRound = d3_rebind(scale, linear.rangeRound);
-  scale.inteprolate = d3_rebind(scale, linear.interpolate);
+  scale.interpolate = d3_rebind(scale, linear.interpolate);
   scale.ticks = tick.ticks;
   scale.tickFormat = tick.tickFormat;
 
   scale.exponent = function(x) {
-    if (!arguments.length) return p;
+    if (!arguments.length) return exponent;
     var domain = scale.domain();
-    p = x;
-    b = 1 / x;
+    exponent = x;
     return scale.domain(domain);
   };
 
   return scale;
 };
+
+function d3_scale_pow(e) {
+  return function(x) {
+    return Math.pow(x, e);
+  };
+}
+
+function d3_scale_pown(e) {
+  return function(x) {
+    return -Math.pow(-x, e);
+  };
+}
diff --git a/tests/test-call.js b/tests/test-call.js
new file mode 100644
index 0000000000000..2460fbb0022b1
--- /dev/null
+++ b/tests/test-call.js
@@ -0,0 +1,21 @@
+require("./../lib/env-js/envjs/node");
+require("./../lib/sizzle/sizzle");
+require("./../d3.min");
+
+var vis = d3.select("body");
+
+console.log("zero arguments:");
+vis.call(function(a, b) {
+  console.log("  this:", vis === this ? "vis" : this);
+  console.log("  a:", vis === a ? "vis" : a);
+  console.log("  b:", b);
+});
+console.log("");
+
+console.log("one argument:");
+vis.call(function(a, b) {
+  console.log("  this:", vis === this ? "vis" : this);
+  console.log("  a:", vis === a ? "vis" : a);
+  console.log("  b:", b);
+}, "test");
+console.log("");
diff --git a/tests/test-call.out b/tests/test-call.out
new file mode 100644
index 0000000000000..51d04f87e35b3
--- /dev/null
+++ b/tests/test-call.out
@@ -0,0 +1,10 @@
+zero arguments:
+  this: vis
+  a: vis
+  b: undefined
+
+one argument:
+  this: vis
+  a: vis
+  b: test
+
diff --git a/tests/test-scale-pow.js b/tests/test-scale-pow.js
new file mode 100644
index 0000000000000..d6f347ce355a0
--- /dev/null
+++ b/tests/test-scale-pow.js
@@ -0,0 +1,53 @@
+require("./../lib/env-js/envjs/node");
+require("./../lib/sizzle/sizzle");
+require("./../d3");
+require("./../d3.time");
+
+var f = d3.format(" .3f");
+
+var x = d3.scale.pow().exponent(2);
+console.log("domain([0, 1]).range([0, 1]):");
+console.log("         -0.5  -> ", f(x(-0.5)));
+console.log("          0.0  -> ", f(x(0.0)));
+console.log("          0.5  -> ", f(x(0.5)));
+console.log("          1.0  -> ", f(x(1.0)));
+console.log("          1.5  -> ", f(x(1.5)));
+console.log("");
+
+var x = d3.scale.pow().exponent(2).domain([1, 2]);
+console.log("domain([1, 2]).range([0, 1]):");
+console.log("          0.5  -> ", f(x(0.5)));
+console.log("          1.0  -> ", f(x(1.0)));
+console.log("          1.5  -> ", f(x(1.5)));
+console.log("          2.0  -> ", f(x(2.0)));
+console.log("          2.5  -> ", f(x(2.5)));
+console.log("");
+
+var x = d3.scale.pow().exponent(2).domain([new Date(1990, 0, 1), new Date(1991, 0, 1)]);
+console.log("domain([01/01/1990, 01/01/1991]).range([0, 1]):");
+console.log("   10/20/1989  -> ", f(x(new Date(1989, 09, 20))));
+console.log("   01/01/1990  -> ", f(x(new Date(1990, 00, 01))));
+console.log("   03/15/1990  -> ", f(x(new Date(1990, 02, 15))));
+console.log("   05/27/1990  -> ", f(x(new Date(1990, 04, 27))));
+console.log("   01/01/1991  -> ", f(x(new Date(1991, 00, 01))));
+console.log("   03/15/1991  -> ", f(x(new Date(1991, 02, 15))));
+console.log("");
+
+var x = d3.scale.pow().exponent(2).range(["red", "blue"]);
+console.log("domain([0, 1]).range([\"red\", \"blue\"]):");
+console.log("         -0.5  -> ", x(-0.5));
+console.log("          0.0  -> ", x(0.0));
+console.log("          0.5  -> ", x(0.5));
+console.log("          1.0  -> ", x(1.0));
+console.log("          1.5  -> ", x(1.5));
+console.log("");
+
+var x = d3.scale.pow().exponent(2).range(["red", "blue"]).interpolate(d3.interpolateHsl);
+console.log("domain([0, 1]).range([\"red\", \"blue\"]).interpolate(hsl):");
+console.log("        -0.50  -> ", x(-0.50));
+console.log("         0.00  -> ", x(0.00));
+console.log("         0.50  -> ", x(0.50));
+console.log("        √0.50  -> ", x(Math.SQRT1_2));
+console.log("         1.00  -> ", x(1.00));
+console.log("         2.00  -> ", x(2.00));
+console.log("");
diff --git a/tests/test-scale-pow.out b/tests/test-scale-pow.out
new file mode 100644
index 0000000000000..df2d1846bd6b3
--- /dev/null
+++ b/tests/test-scale-pow.out
@@ -0,0 +1,37 @@
+domain([0, 1]).range([0, 1]):
+         -0.5  ->   0.250
+          0.0  ->   0.000
+          0.5  ->   0.250
+          1.0  ->   1.000
+          1.5  ->   2.250
+
+domain([1, 2]).range([0, 1]):
+          0.5  ->  −0.250
+          1.0  ->   0.000
+          1.5  ->   0.417
+          2.0  ->   1.000
+          2.5  ->   1.750
+
+domain([01/01/1990, 01/01/1991]).range([0, 1]):
+   10/20/1989  ->  −0.194
+   01/01/1990  ->   0.000
+   03/15/1990  ->   0.196
+   05/27/1990  ->   0.394
+   01/01/1991  ->   1.000
+   03/15/1991  ->   1.206
+
+domain([0, 1]).range(["red", "blue"]):
+         -0.5  ->  rgb(191,0,64)
+          0.0  ->  rgb(255,0,0)
+          0.5  ->  rgb(191,0,64)
+          1.0  ->  rgb(0,0,255)
+          1.5  ->  rgb(-319,0,574)
+
+domain([0, 1]).range(["red", "blue"]).interpolate(hsl):
+        -0.50  ->  #ffff00
+         0.00  ->  #ff0000
+         0.50  ->  #ffff00
+        √0.50  ->  #00ff00
+         1.00  ->  #0000ff
+         2.00  ->  #0000ff
+
diff --git a/tests/test-scale-sqrt.js b/tests/test-scale-sqrt.js
new file mode 100644
index 0000000000000..4a5c4623a3f95
--- /dev/null
+++ b/tests/test-scale-sqrt.js
@@ -0,0 +1,52 @@
+require("./../lib/env-js/envjs/node");
+require("./../lib/sizzle/sizzle");
+require("./../d3");
+require("./../d3.time");
+
+var f = d3.format(" .3f");
+
+var x = d3.scale.sqrt();
+console.log("domain([0, 1]).range([0, 1]):");
+console.log("        -0.50  -> ", f(x(-0.50)));
+console.log("         0.00  -> ", f(x(0.00)));
+console.log("         0.25  -> ", f(x(0.25)));
+console.log("         0.50  -> ", f(x(0.50)));
+console.log("         1.00  -> ", f(x(1.00)));
+console.log("         4.00  -> ", f(x(4.00)));
+console.log("");
+
+var x = d3.scale.sqrt().domain([0, -1]);
+console.log("domain([0, -1]).range([0, 1]):");
+console.log("         0.50  -> ", f(x(0.50)));
+console.log("         0.00  -> ", f(x(0.00)));
+console.log("        -0.25  -> ", f(x(-0.25)));
+console.log("        -0.50  -> ", f(x(-0.50)));
+console.log("        -1.00  -> ", f(x(-1.00)));
+console.log("        -4.00  -> ", f(x(-4.00)));
+console.log("");
+
+var x = d3.scale.sqrt().domain([1, 2]);
+console.log("domain([1, 2]).range([0, 1]):");
+console.log("          0.5  -> ", f(x(0.5)));
+console.log("          1.0  -> ", f(x(1.0)));
+console.log("          1.5  -> ", f(x(1.5)));
+console.log("          2.0  -> ", f(x(2.0)));
+console.log("          2.5  -> ", f(x(2.5)));
+console.log("");
+
+var x = d3.scale.sqrt().range(["red", "blue"]);
+console.log("domain([0, 1]).range([\"red\", \"blue\"]):");
+console.log("         0.00  -> ", x(0.00));
+console.log("         0.25  -> ", x(0.25));
+console.log("         1.00  -> ", x(1.00));
+console.log("         4.00  -> ", x(4.00));
+console.log("");
+
+var x = d3.scale.sqrt().domain([1, 0]).range(["red", "blue"]).interpolate(d3.interpolateHsl);
+console.log("domain([1, 0]).range([\"red\", \"blue\"]).interpolate(hsl):");
+console.log("         0.00  -> ", x(0.00));
+console.log("         0.25  -> ", x(0.25));
+console.log("         0.50  -> ", x(0.50));
+console.log("         1.00  -> ", x(1.00));
+console.log("         4.00  -> ", x(4.00));
+console.log("");
diff --git a/tests/test-scale-sqrt.out b/tests/test-scale-sqrt.out
new file mode 100644
index 0000000000000..518782eb962e5
--- /dev/null
+++ b/tests/test-scale-sqrt.out
@@ -0,0 +1,36 @@
+domain([0, 1]).range([0, 1]):
+        -0.50  ->   NaN
+         0.00  ->   0.000
+         0.25  ->   0.500
+         0.50  ->   0.707
+         1.00  ->   1.000
+         4.00  ->   2.000
+
+domain([0, -1]).range([0, 1]):
+         0.50  ->   NaN
+         0.00  ->   0.000
+        -0.25  ->   0.500
+        -0.50  ->   0.707
+        -1.00  ->   1.000
+        -4.00  ->   2.000
+
+domain([1, 2]).range([0, 1]):
+          0.5  ->  −0.707
+          1.0  ->   0.000
+          1.5  ->   0.543
+          2.0  ->   1.000
+          2.5  ->   1.403
+
+domain([0, 1]).range(["red", "blue"]):
+         0.00  ->  rgb(255,0,0)
+         0.25  ->  rgb(128,0,128)
+         1.00  ->  rgb(0,0,255)
+         4.00  ->  rgb(-255,0,510)
+
+domain([1, 0]).range(["red", "blue"]).interpolate(hsl):
+         0.00  ->  #0000ff
+         0.25  ->  #00ff00
+         0.50  ->  #d3ff00
+         1.00  ->  #ff0000
+         4.00  ->  #00ff00
+