diff --git a/ch09-writing-your-own-methods/ask.rb b/ch09-writing-your-own-methods/ask.rb
index 01716eb35..b92a4d625 100644
--- a/ch09-writing-your-own-methods/ask.rb
+++ b/ch09-writing-your-own-methods/ask.rb
@@ -1,3 +1,15 @@
 def ask question
-  # your code here
-end
\ No newline at end of file
+  while true
+    puts question
+    reply = gets.chomp.downcase
+
+    if reply == "yes"
+      return true
+    elsif reply == "no"
+      return false
+    end
+
+    puts "Please answer \"yes\" or \"no\"."
+  end
+  answer
+end
diff --git a/ch09-writing-your-own-methods/old_school_roman_numerals.rb b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
index ca6589f2d..23e270c90 100644
--- a/ch09-writing-your-own-methods/old_school_roman_numerals.rb
+++ b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
@@ -1,3 +1,19 @@
 def old_roman_numeral num
-  # your code here
-end
\ No newline at end of file
+
+  x = ""
+
+  x = x + "M" * (num / 1000)
+  x = x + "D" * (num % 1000 / 500)
+  x = x + "C" * (num % 500 / 100)
+  x = x + "L" * (num % 100 / 50)
+  x = x + "X" * (num % 50 / 10)
+  x = x + "V" * (num % 10 / 5)
+  x = x + "I" * (num % 5 / 1)
+
+  x
+
+end
+
+puts old_roman_numeral 141
+puts old_roman_numeral 3000
+puts old_roman_numeral 6
diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index 5c93b59ac..333adbd51 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -1,3 +1,44 @@
 def roman_numeral num
-  # your code here
-end
\ No newline at end of file
+
+  thou = (num / 1000)
+  hund = (num % 1000 / 100)
+  tens = (num % 100 / 10)
+  ones = (num % 10)
+
+  x = "M" * thou
+
+  if hund == 4
+    x = x + "CD"
+  elsif hund == 9
+    x = x + "CM"
+  else
+    x = x + "D" * (num % 1000 / 500)
+    x = x + "C" * (num % 500 / 100)
+  end
+
+  if tens == 4
+    x = x + "XL"
+  elsif tens == 9
+    x = x + "XC"
+  else
+    x = x + "L" * (num % 100 / 50)
+    x = x + "X" * (num % 50 / 10)
+  end
+
+  if ones == 4
+    x = x + "IV"
+  elsif ones == 9
+    x = x + "IX"
+  else
+    x = x + "V" * (num % 10 / 5)
+    x = x + "I" * (num % 5 / 1)
+  end
+
+  x # returns roman numeral
+end
+
+# test criteria below
+puts (roman_numeral 4)
+puts (roman_numeral 1949)
+puts (roman_numeral 2654)
+puts (roman_numeral 9)
diff --git a/ch10-nothing-new/dictionary_sort.rb b/ch10-nothing-new/dictionary_sort.rb
index c9893d0fd..85b45ff55 100644
--- a/ch10-nothing-new/dictionary_sort.rb
+++ b/ch10-nothing-new/dictionary_sort.rb
@@ -1,3 +1,27 @@
 def dictionary_sort arr
-  # your code here
-end
\ No newline at end of file
+  recursive_sort arr, []
+end
+
+def recursive_sort unsorted, sorted
+  if unsorted.length <= 0
+    return sorted
+  end
+
+  small = unsorted.pop
+
+  remain_unsorted = []
+
+  unsorted.each do | x |
+    if x.downcase < small.downcase
+      remain_unsorted.push small
+      small = x
+    else
+      remain_unsorted.push x
+    end
+  end
+
+  sorted.push small
+  recursive_sort remain_unsorted, sorted
+end
+
+puts(dictionary_sort(["beans","Eggs","Brunch","apple","Acorn","badger"]))
diff --git a/ch10-nothing-new/english_number.rb b/ch10-nothing-new/english_number.rb
index c0129bc4e..103f2e88e 100644
--- a/ch10-nothing-new/english_number.rb
+++ b/ch10-nothing-new/english_number.rb
@@ -1,3 +1,117 @@
 def english_number number
-  # your code here
+  if number < 0
+    return 'Please enter a number that isn\'t negative.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+    num_string = '' # String to be returned.
+
+  ones_place = ['one', 'two', 'three',
+                'four', 'five', 'six',
+                'seven', 'eight', 'nine']
+
+  tens_place = ['ten', 'twenty', 'thirty',
+                'forty', 'fifty', 'sixty',
+                'seventy', 'eighty', 'ninety']
+
+
+  teenagers = ['eleven', 'twelve', 'thirteen',
+               'fourteen', 'fifteen', 'sixteen',
+               'seventeen', 'eighteen', 'nineteen']
+
+  zillions = [['hundred', 2],
+              ['thousand', 3],
+              ['million', 6],
+              ['billion', 9],
+              ['trillion', 12],
+              ['quadrillion', 15],
+              ['quintillion', 18],
+              ['sextillion', 21],
+              ['septillion', 24],
+              ['octillion', 27],
+              ['nonillion', 30],
+              ['decillion', 33],
+              ['undecillion', 36],
+              ['duodecillion', 39],
+              ['tredecillion', 42],
+              ['quattuordecillion', 45],
+              ['quindecillion', 48],
+              ['sexdecillion', 51],
+              ['septendecillion', 54],
+              ['octodecillion', 57],
+              ['novemdecillion', 60],
+              ['vigintillion', 63],
+              ['googol', 100]]
+
+  # "left" is how much of the number we still have left to write out.
+  # "write" is the part we are writing out right now.
+    left = number
+
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10 ** zil_pair[1]
+    write = left/zil_base # How many zillions left?
+    left = left - write*zil_base # Subtract off those zillions.
+
+    if write > 0
+      # Recursion:
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        # So we don't write 'two billionfifty-one'...
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10 # How many tens left?
+  left = left - write*10 # Subtract off those tens.
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+      # Since we can't write "tenty-two" instead of
+      # "twelve", we have to make a special exception for these.
+      num_string = num_string + teenagers[left-1]
+      # Since we took care of the digit in the
+      # ones place already, we have nothing left to write.
+      left = 0
+    else
+      num_string = num_string + tens_place[write-1]
+    end
+
+    if left > 0
+      # So we don't write 'sixtyfour'...
+      num_string = num_string + '-'
+    end
+  end
+
+  write = left # How many ones left to write out?
+  left = 0 # Subtract off those ones.
+
+  if write > 0
+    num_string = num_string + ones_place[write-1]
+  end
+
+  # Now we just return "num_string"...
+  num_string
 end
+
+puts english_number( 0)
+puts english_number( 9)
+puts english_number( 10)
+puts english_number( 11)
+puts english_number( 17)
+puts english_number( 32)
+puts english_number( 88)
+puts english_number( 99)
+puts english_number(100)
+puts english_number(101)
+puts english_number(234)
+puts english_number(3211)
+puts english_number(999999)
+puts english_number(1000000000000)
+puts english_number(109238745102938560129834709285360238475982374561034)
diff --git a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
index 801de24bd..4f622a271 100644
--- a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
+++ b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
@@ -1 +1,109 @@
-# your code here
\ No newline at end of file
+# English number:
+def english_number number
+  if number < 0
+    return 'Please enter a number that isn\'t negative.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+    num_string = ''
+
+  ones_place = ['one', 'two', 'three',
+                'four', 'five', 'six',
+                'seven', 'eight', 'nine']
+
+  tens_place = ['ten', 'twenty', 'thirty',
+                'forty', 'fifty', 'sixty',
+                'seventy', 'eighty', 'ninety']
+
+
+  teenagers = ['eleven', 'twelve', 'thirteen',
+               'fourteen', 'fifteen', 'sixteen',
+               'seventeen', 'eighteen', 'nineteen']
+
+  zillions = [['hundred', 2],
+              ['thousand', 3],
+              ['million', 6],
+              ['billion', 9],
+              ['trillion', 12],
+              ['quadrillion', 15],
+              ['quintillion', 18],
+              ['sextillion', 21],
+              ['septillion', 24],
+              ['octillion', 27],
+              ['nonillion', 30],
+              ['decillion', 33],
+              ['undecillion', 36],
+              ['duodecillion', 39],
+              ['tredecillion', 42],
+              ['quattuordecillion', 45],
+              ['quindecillion', 48],
+              ['sexdecillion', 51],
+              ['septendecillion', 54],
+              ['octodecillion', 57],
+              ['novemdecillion', 60],
+              ['vigintillion', 63],
+              ['googol', 100]]
+
+    left = number
+
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10 ** zil_pair[1]
+    write = left/zil_base
+    left = left - write*zil_base
+
+    if write > 0
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10
+  left = left - write*10
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+      num_string = num_string + teenagers[left-1]
+      left = 0
+    else
+      num_string = num_string + tens_place[write-1]
+    end
+
+    if left > 0
+      num_string = num_string + '-'
+    end
+  end
+
+  write = left
+  left = 0
+
+  if write > 0
+    num_string = num_string + ones_place[write-1]
+  end
+
+  num_string
+end
+
+# 99 Bottles Starts Here:
+start_num = 9999
+current_num = start_num
+
+while current_num > 2
+  puts english_number(current_num).capitalize + " bottles of beer on the wall" +
+    english_number(current_num) + " bottles of beer!"
+  current_num = current_num - 1
+  puts "Take one down, pass it around, " + english_number(current_num) +
+    " bottles of beer on the wall!"
+end
+
+puts "Two bottles of beer on the wall, two bottles of beer!"
+puts "Take one down, pass it around, one bottle of beer on the wall!"
+puts "One bottle of beer on the wall, one bottle of beer!"
+puts "Take one down , pass it around, no more bottles of beer on the wall!"
diff --git a/ch10-nothing-new/shuffle.rb b/ch10-nothing-new/shuffle.rb
index a486ad94c..566576ab1 100644
--- a/ch10-nothing-new/shuffle.rb
+++ b/ch10-nothing-new/shuffle.rb
@@ -1,3 +1,26 @@
 def shuffle arr
-  # your code here
-end
\ No newline at end of file
+  shuffled = []
+
+  while arr.length > 0
+    rand_index = rand(arr.length)
+    index = 0
+    new_arr = []
+
+    arr.each do |x|
+      if index == rand_index
+        shuffled.push x
+      else
+        new_arr.push x
+      end
+
+      index = index + 1
+    end
+
+    arr = new_arr
+  end
+
+  shuffled
+
+end
+
+puts(shuffle([1,2,3,4,5,6,7,8,9]))
diff --git a/ch10-nothing-new/sort.rb b/ch10-nothing-new/sort.rb
index 44c6deb58..6571b1a1e 100644
--- a/ch10-nothing-new/sort.rb
+++ b/ch10-nothing-new/sort.rb
@@ -1,3 +1,27 @@
 def sort arr
-  # your code here
-end
\ No newline at end of file
+  recursive_sort arr, []
+end
+
+def recursive_sort unsorted, sorted
+  if unsorted.length <= 0
+    return sorted
+  end
+
+  small = unsorted.pop
+
+  remain_unsorted = []
+
+  unsorted.each do | x |
+    if x < small
+      remain_unsorted.push small
+      small = x
+    else
+      remain_unsorted.push x
+    end
+  end
+
+  sorted.push small
+  recursive_sort remain_unsorted, sorted
+end
+
+puts(sort(["beans","Eggs","Brunch","apple","Acorn","badger"]))
diff --git a/ch11-reading-and-writing/build_a_better_playlist.rb b/ch11-reading-and-writing/build_a_better_playlist.rb
index 3b31bd241..edfcb8baf 100644
--- a/ch11-reading-and-writing/build_a_better_playlist.rb
+++ b/ch11-reading-and-writing/build_a_better_playlist.rb
@@ -1,3 +1,51 @@
+# solution visited - fully understood
+
 def music_shuffle filenames
-  # your code here
+  # We don't want a perfectly random shuffle, so let's
+  # instead do a shuffle like card-shuffling. Let's
+  # shuffle the "deck" twice, then cut it once. That's
+  # not enough times to make a perfect shuffle, but it
+  # does mix things up a bit.
+  # Before we do anything, let's actually *sort* the
+  # input, since we don't know how shuffled it might
+  # already be, and we don't want it to be *too* random.
+  filenames = filenames.sort
+  len = filenames.length
+
+  # Now we shuffle twice.
+  2.times do
+    l_idx = 0 # index of next card in left pile
+    r_idx = len/2 # index of next card in right pile
+    shuf = []
+    # NOTE: If we have an odd number of "cards",
+    # then the right pile will be larger.
+
+    while shuf.length < len
+      if shuf.length%2 == 0
+        # take card from right pile
+        shuf.push(filenames[r_idx])
+        r_idx = r_idx + 1
+      else
+        # take card from left pile
+        shuf.push(filenames[l_idx])
+        l_idx = l_idx + 1
+      end
+    end
+
+    filenames = shuf
+  end
+  # And cut the deck.
+  arr = []
+  cut = rand(len) # index of card to cut at
+  idx = 0
+
+  while idx < len
+    arr.push(filenames[(idx+cut)%len])
+    idx = idx + 1
+  end
+
+  arr
 end
+# songs = ['aa/bbb', 'aa/ccc', 'aa/ddd',
+#          'AAA/xxxx', 'AAA/yyyy', 'AAA/zzzz', 'foo/bar']
+# puts(music_shuffle(songs))
diff --git a/ch11-reading-and-writing/build_your_own_playlist.rb b/ch11-reading-and-writing/build_your_own_playlist.rb
index 801de24bd..1d158f17b 100644
--- a/ch11-reading-and-writing/build_your_own_playlist.rb
+++ b/ch11-reading-and-writing/build_your_own_playlist.rb
@@ -1 +1,36 @@
-# your code here
\ No newline at end of file
+# Shuffle method:
+def shuffle arr
+  shuffled = []
+
+  while arr.length > 0
+    rand_index = rand(arr.length)
+    index = 0
+    new_arr = []
+
+    arr.each do |x|
+      if index == rand_index
+        shuffled.push x
+      else
+        new_arr.push x
+      end
+
+      index = index + 1
+    end
+
+    arr = new_arr
+  end
+
+  shuffled
+
+end
+
+# Playlist:
+all_mp3s = shuffle(Dir['**/*.mp3'])
+
+File.open 'playlist.m3u', 'w' do |f|
+  all_mp3s.each do |mp3|
+    f.write mp3+"\n"
+  end
+end
+
+puts "Complete!"
diff --git a/ch11-reading-and-writing/safer_picture_downloading.rb b/ch11-reading-and-writing/safer_picture_downloading.rb
index 801de24bd..e4cc32333 100644
--- a/ch11-reading-and-writing/safer_picture_downloading.rb
+++ b/ch11-reading-and-writing/safer_picture_downloading.rb
@@ -1 +1,53 @@
-# your code here
\ No newline at end of file
+# This is where she stores her pictures before
+# she gets her YAML on and moves them to the server.
+# Just for my own convenience, I'll go there now.
+
+Dir.chdir '/home/stevie/Test2'
+
+# First we find all of the pictures to be moved.
+pic_names = Dir['/home/stevie/Test1/*.jpg']
+
+puts 'What would you like to call this batch?'
+batch_name = gets.chomp
+
+puts
+print "Downloading #{pic_names.length} files: "
+
+# This will be our counter. We'll start at 1 today,
+# though normally I like to count from 0.
+pic_number = 1
+
+pic_names.each do |name|
+  print '.' # This is our "progress bar".
+
+  new_name = if pic_number < 10
+    "#{batch_name}0#{pic_number}"
+  else
+    "#{batch_name}#{pic_number}"
+  end
+
+  save_name = new_name + '.jpg'
+  while FileTest.exist? save_name
+    new_name += 'a'
+    save_name = new_name + '.jpg'
+  end
+
+  # This renames the picture, but since "name"
+  # has a big long path on it, and "new_name"
+  # doesn't, it also moves the file to the
+  # current working directory, which is now
+  # Katy's PictureInbox folder.
+  # Since it's a *move*, this effectively
+  # downloads and deletes the originals.
+  # And since this is a memory card, not a
+  # hard drive, each of these takes a second
+  # or so; hence, the little dots let her
+  # know that my program didn't hose her machine.
+
+  File.rename name, save_name
+  # Finally, we increment the counter.
+  pic_number = pic_number + 1
+end
+
+puts # This is so we aren't on progress bar line.
+puts 'Done, cutie!'
diff --git a/ch12-new-classes-of-objects/birthday_helper.rb b/ch12-new-classes-of-objects/birthday_helper.rb
index 801de24bd..16bcbcae3 100644
--- a/ch12-new-classes-of-objects/birthday_helper.rb
+++ b/ch12-new-classes-of-objects/birthday_helper.rb
@@ -1 +1,23 @@
-# your code here
\ No newline at end of file
+birth_dates = {}
+File.read('birthdates.txt').each_line do |line|
+  line = line.chomp
+  first_comma = 0
+  while line[first_comma] != ',' &&
+      first_comma < line.length
+    first_comma = first_comma + 1
+  end
+
+  name = line[0..(first_comma - 1)]
+  date = line[-12..-1]
+  birth_dates[name] = date
+end
+
+puts 'Whose birthday would you like to know?'
+name = gets.chomp
+date = birth_dates[name]
+
+if date == nil
+  puts "Oooh, I don't know that one..."
+else
+  puts date[0..5]
+end
diff --git a/ch12-new-classes-of-objects/happy_birthday.rb b/ch12-new-classes-of-objects/happy_birthday.rb
index 801de24bd..ce6b560b5 100644
--- a/ch12-new-classes-of-objects/happy_birthday.rb
+++ b/ch12-new-classes-of-objects/happy_birthday.rb
@@ -1 +1,15 @@
-# your code here
\ No newline at end of file
+puts "What year were you born?"
+year = gets.chomp.to_i
+
+puts "What month were you born (1-12)?"
+month = gets.chomp.to_i
+
+puts "And finally, on what day of that month?"
+day = gets.chomp.to_i
+
+age = (Time.new - Time.local(year,month,day))/(60*60*24*365.25).to_i
+
+while age > 1
+  puts "SPANK!"
+  age = age - 1
+end
diff --git a/ch12-new-classes-of-objects/one_billion_seconds.rb b/ch12-new-classes-of-objects/one_billion_seconds.rb
index 801de24bd..301d9f1d6 100644
--- a/ch12-new-classes-of-objects/one_billion_seconds.rb
+++ b/ch12-new-classes-of-objects/one_billion_seconds.rb
@@ -1 +1,5 @@
-# your code here
\ No newline at end of file
+# I am this many seconds old:
+puts((Time.new) - Time.gm(1988,9,28,13,58))
+
+# I will be a billion seconds old on:
+puts(Time.gm(1988,9,28,13,58) + 10**9)
diff --git a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
index 037b6cb09..0531696e6 100644
--- a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
+++ b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
@@ -1,3 +1,30 @@
 def roman_to_integer roman
-  # your code here
-end
\ No newline at end of file
+  digit_vals = {'i' => 1,
+                'v' => 5,
+                'x' => 10,
+                'l' => 50,
+                'c' => 100,
+                'd' => 500,
+                'm' => 1000}
+  total = 0
+  prev = 0
+  index = roman.length - 1
+  while index >= 0
+    c = roman[index].downcase
+    index = index - 1
+    val = digit_vals[c]
+    if !val
+      puts 'This is not a valid roman numeral!'
+      return
+    end
+
+    if val < prev
+      val = val * -1
+    else
+      prev = val
+    end
+    total = total + val
+  end
+
+  total
+end
diff --git a/ch13-creating-new-classes/extend_built_in_classes.rb b/ch13-creating-new-classes/extend_built_in_classes.rb
index c3e793933..c4cef265b 100644
--- a/ch13-creating-new-classes/extend_built_in_classes.rb
+++ b/ch13-creating-new-classes/extend_built_in_classes.rb
@@ -1,3 +1,23 @@
 class Integer
-  # your code here
-end
\ No newline at end of file
+
+  def to_roman
+    x = ""
+    x = x + "M" * (self / 1000)
+    x = x + "D" * (self % 1000 / 500)
+    x = x + "C" * (self % 500 / 100)
+    x = x + "L" * (self % 100 / 50)
+    x = x + "X" * (self % 50 / 10)
+    x = x + "V" * (self % 10 / 5)
+    x = x + "I" * (self % 5 / 1)
+    x
+  end
+
+  def factorial
+    if self <= 1
+      1
+    else
+      self * (self-1).factorial
+    end
+  end
+
+end
diff --git a/ch13-creating-new-classes/interactive_baby_dragon.rb b/ch13-creating-new-classes/interactive_baby_dragon.rb
index 801de24bd..90cc9e59d 100644
--- a/ch13-creating-new-classes/interactive_baby_dragon.rb
+++ b/ch13-creating-new-classes/interactive_baby_dragon.rb
@@ -1 +1,134 @@
-# your code here
\ No newline at end of file
+# Dragon Class from Chapter 13:
+class Dragon
+
+  def initialize name
+    @name = name
+    @asleep = false
+    @stuff_in_belly = 10 # He's full.
+    @stuff_in_intestine = 0 # He doesn't need to go.
+
+    puts "#{@name} is born."
+  end
+
+  def feed
+    puts "You feed #{@name}."
+    @stuff_in_belly = 10
+    passage_of_time
+  end
+
+  def walk
+    puts "You walk #{@name}."
+    @stuff_in_intestine = 0
+    passage_of_time
+  end
+
+  def put_to_bed
+    puts "You put #{@name} to bed."
+    @asleep = true
+    3.times do
+      if @asleep
+        passage_of_time
+      end
+      if @asleep
+        puts "#{@name} snores, filling the room with smoke."
+      end
+    end
+    if @asleep
+      @asleep = false
+      puts "#{@name} wakes up slowly."
+    end
+  end
+
+  def toss
+    puts "You toss #{@name} up into the air."
+    puts 'He giggles, which singes your eyebrows.'
+    passage_of_time
+  end
+
+  def rock
+    puts "You rock #{@name} gently."
+    @asleep = true
+    puts 'He briefly dozes off...'
+    passage_of_time
+    if @asleep
+      @asleep = false
+      puts '...but wakes when you stop.'
+    end
+  end
+
+  private
+  # "private" means that the methods defined here are
+  # methods internal to the object. (You can feed your
+  # dragon, but you can't ask him whether he's hungry.)
+
+  def hungry?
+    # Method names can end with "?".
+    # Usually, we do this only if the method
+    # returns true or false, like this:
+    @stuff_in_belly <= 2
+  end
+
+  def poopy?
+    @stuff_in_intestine >= 8
+  end
+
+  def passage_of_time
+    if @stuff_in_belly > 0
+      # Move food from belly to intestine.
+      @stuff_in_belly = @stuff_in_belly - 1
+      @stuff_in_intestine = @stuff_in_intestine + 1
+    else # Our dragon is starving!
+      if @asleep
+        @asleep = false
+        puts 'He wakes up suddenly!'
+      end
+      puts "#{@name} is starving! In desperation, he ate YOU!"
+      exit # This quits the program.
+    end
+    if @stuff_in_intestine >= 10
+      @stuff_in_intestine = 0
+      puts "Whoops! #{@name} had an accident..."
+    end
+    if hungry?
+      if @asleep
+        @asleep = false
+        puts 'He wakes up suddenly!'
+      end
+      puts "#{@name}'s stomach grumbles..."
+    end
+    if poopy?
+      if @asleep
+        @asleep = false
+        puts 'He wakes up suddenly!'
+      end
+      puts "#{@name} does the potty dance..."
+    end
+  end
+end
+
+#Interactive Baby Dragon
+puts 'What would you like to name your baby dragon?'
+name = gets.chomp
+pet = Dragon.new name
+
+while true
+  puts
+  puts 'commands: feed, toss, walk, rock, put to bed, exit'
+  command = gets.chomp.downcase # to eliminate case sensitivity
+
+  if command == 'exit'
+    exit
+  elsif command == 'feed'
+    pet.feed
+  elsif command == 'toss'
+    pet.toss
+  elsif command == 'walk'
+    pet.walk
+  elsif command == 'rock'
+    pet.rock
+  elsif command == 'put to bed'
+    pet.put_to_bed
+  else
+    puts 'Huh? Please type one of the commands.'
+  end
+end
diff --git a/ch13-creating-new-classes/orange_tree.rb b/ch13-creating-new-classes/orange_tree.rb
index 025d08907..92372fbdd 100644
--- a/ch13-creating-new-classes/orange_tree.rb
+++ b/ch13-creating-new-classes/orange_tree.rb
@@ -5,7 +5,78 @@
 # have the tree die after 25 years.
 # check out the rspec spec/ch13/orange_tree_spec.rb to see what strings we're looking for in the responses.
 
-
 class OrangeTree
-  # your code here
+  def initialize
+    @height = 0
+    @orange_count = 0
+    @alive = true
+  end
+
+  def height
+    if @alive
+      @height.round(1)
+    else
+      'A dead tree is not very tall. :('
+    end
+  end
+
+  def count_the_oranges
+    if @alive
+      @orange_count
+    else
+      'A dead tree has no oranges. :('
+    end
+  end
+
+  def one_year_passes
+    if @alive
+      @height = @height + 0.4
+      @orange_count = 0 # old oranges fall off
+      if @height > 10 && rand(2) > 0
+        # tree dies
+        @alive = false
+        'Oh, no! The tree is too old, and has died. :('
+      elsif @height > 2
+        # new oranges grow
+        @orange_count = (@height * 15 - 25).to_i
+        "This year your tree grew to #{@height.round(1)}m tall," +
+          " and produced #{@orange_count} oranges."
+      else
+        "This year your tree grew to #{@height.round(1)}m tall," +
+          " but is still too young to bear fruit."
+      end
+    else
+      'A year later, the tree is still dead. :('
+    end
+  end
+
+  def pick_an_orange
+    if @alive
+      if @orange_count > 0
+        @orange_count = @orange_count - 1
+        'You pick a juicy, delicious orange!'
+      else
+        'You search every branch, but find no oranges.'
+      end
+    else
+      'A dead tree has nothing to pick. :('
+    end
+  end
 end
+
+# ot = OrangeTree.new
+# 23.times do
+#   ot.one_year_passes
+# end
+
+# puts(ot.one_year_passes)
+# puts(ot.count_the_oranges)
+# puts(ot.height)
+# puts(ot.one_year_passes)
+# puts(ot.one_year_passes)
+# puts(ot.one_year_passes)
+# puts(ot.one_year_passes)
+# puts(ot.one_year_passes)
+# puts(ot.height)
+# puts(ot.count_the_oranges)
+# puts(ot.pick_an_orange)
diff --git a/ch14-blocks-and-procs/better_program_logger.rb b/ch14-blocks-and-procs/better_program_logger.rb
index 0e2e18d57..219532e28 100644
--- a/ch14-blocks-and-procs/better_program_logger.rb
+++ b/ch14-blocks-and-procs/better_program_logger.rb
@@ -1,3 +1,28 @@
-def log desc, &block
-  # your code here
-end
\ No newline at end of file
+$nesting_depth = 0
+
+def better_log desc, &block
+
+  indent = ' ' * $nesting_depth
+
+  puts indent + 'Beginning "' + desc + '"...'
+
+  $nesting_depth = $nesting_depth + 1
+  x = block.call
+
+  $nesting_depth = $nesting_depth - 1
+  puts indent + '..."' + desc + '" finished, returning: ' + x.to_s
+end
+
+better_log 'outer block' do
+  better_log 'some little block' do
+    better_log 'teeny-tiny block' do
+      'lots of love'
+  end
+  42
+end
+
+  better_log 'yet another block' do
+    'I love Indian food!'
+  end
+  false
+end
diff --git a/ch14-blocks-and-procs/even_better_profiling.rb b/ch14-blocks-and-procs/even_better_profiling.rb
index b01b78fd8..125c68ece 100644
--- a/ch14-blocks-and-procs/even_better_profiling.rb
+++ b/ch14-blocks-and-procs/even_better_profiling.rb
@@ -1,3 +1,11 @@
 def profile block_description, &block
-  # your code here
-end
\ No newline at end of file
+  on = true
+  if on
+    start_time = Time.new
+    block.call
+    duration = Time.new - start_time
+    puts "#{block_description}: #{duration} seconds"
+  else
+    block.call
+  end
+end
diff --git a/ch14-blocks-and-procs/grandfather_clock.rb b/ch14-blocks-and-procs/grandfather_clock.rb
index 916f6d354..f2da114c5 100644
--- a/ch14-blocks-and-procs/grandfather_clock.rb
+++ b/ch14-blocks-and-procs/grandfather_clock.rb
@@ -1,3 +1,9 @@
 def grandfather_clock &block
-  # your code here
-end
\ No newline at end of file
+  hr = (Time.new.hour + 11) % 12 + 1
+  hr.times(&block)
+end
+
+grandfather_clock { puts 'DONG!' }
+grandfather_clock { puts 'BEEP!'}
+grandfather_clock { puts 'AH-HA!' }
+grandfather_clock { puts 'BOOM!' }
diff --git a/ch14-blocks-and-procs/program_logger.rb b/ch14-blocks-and-procs/program_logger.rb
index 0e2e18d57..d1bccc320 100644
--- a/ch14-blocks-and-procs/program_logger.rb
+++ b/ch14-blocks-and-procs/program_logger.rb
@@ -1,3 +1,15 @@
-def log desc, &block
-  # your code here
-end
\ No newline at end of file
+def program_log desc, &block
+  puts 'Beginning "' + desc + '"...'
+  x = block.call
+  puts '..."' + desc + '" finished, returning: ' + x.to_s
+end
+
+program_log 'outer block' do
+  program_log 'some little block' do
+    5
+  end
+  program_log 'yet another block' do
+    'I like Thai food!'
+  end
+  false
+end