diff --git a/actionpack/lib/action_dispatch/middleware/cookies.rb b/actionpack/lib/action_dispatch/middleware/cookies.rb
index 20e958c767629..02a4a1c440d55 100644
--- a/actionpack/lib/action_dispatch/middleware/cookies.rb
+++ b/actionpack/lib/action_dispatch/middleware/cookies.rb
@@ -305,7 +305,7 @@ def ensure_secret_secure(secret)
 
         if secret.length < SECRET_MIN_LENGTH
           raise ArgumentError, "Secret should be something secure, " +
-            "like \"#{SecureRandom.hex(16)}\".  The value you " +
+            "like \"#{SecureRandom.hex(16)}\". The value you " +
             "provided, \"#{secret}\", is shorter than the minimum length " +
             "of #{SECRET_MIN_LENGTH} characters"
         end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index 6f21cea2886ee..3fdbc9fce5b3f 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -262,7 +262,7 @@ def checkout
             else
               clear_stale_cached_connections!
               if @size == @checked_out.size
-                raise ConnectionTimeoutError, "could not obtain a database connection#{" within #{@timeout} seconds" if @timeout}.  The max pool size is currently #{@size}; consider increasing it."
+                raise ConnectionTimeoutError, "could not obtain a database connection#{" within #{@timeout} seconds" if @timeout}. The max pool size is currently #{@size}; consider increasing it."
               end
             end
 
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index 9f9c2c42cbeaf..b4969c29d2fae 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -564,7 +564,7 @@ def index_name_for_remove(table_name, options = {})
         def columns_for_remove(table_name, *column_names)
           column_names = column_names.flatten
 
-          raise ArgumentError.new("You must specify at least one column name.  Example: remove_column(:people, :first_name)") if column_names.blank?
+          raise ArgumentError.new("You must specify at least one column name. Example: remove_column(:people, :first_name)") if column_names.blank?
           column_names.map {|column_name| quote_column_name(column_name) }
         end
 
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index ac2da73a84062..bbaac29e5a84c 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -280,7 +280,7 @@ def execute(sql, name = nil)
         end
       rescue ActiveRecord::StatementInvalid => exception
         if exception.message.split(":").first =~ /Packets out of order/
-          raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information.  If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
+          raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information. If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
         else
           raise
         end
@@ -662,7 +662,7 @@ def exec_query(sql, name = 'SQL', binds = [])
               result = @connection.query(sql)
             rescue ActiveRecord::StatementInvalid => exception
               if exception.message.split(":").first =~ /Packets out of order/
-                raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information.  If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
+                raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information. If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
               else
                 raise
               end
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index 187b0b2dd8bf6..a3704fe54a960 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -431,7 +431,7 @@ def execute(sql, name = nil) #:nodoc:
         end
       rescue ActiveRecord::StatementInvalid => exception
         if exception.message.split(":").first =~ /Packets out of order/
-          raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information.  If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
+          raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information. If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
         else
           raise
         end
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index 39c9b6fa1dd58..3c6f52e0fa6c2 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -319,7 +319,7 @@ def add_column(table_name, column_name, type, options = {}) #:nodoc:
       end
 
       def remove_column(table_name, *column_names) #:nodoc:
-        raise ArgumentError.new("You must specify at least one column name.  Example: remove_column(:people, :first_name)") if column_names.empty?
+        raise ArgumentError.new("You must specify at least one column name. Example: remove_column(:people, :first_name)") if column_names.empty?
         column_names.flatten.each do |column_name|
           alter_table(table_name) do |definition|
             definition.columns.delete(definition[column_name])
diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index a0ed14314ef78..089bbed08ad56 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -296,7 +296,7 @@ db_namespace = namespace :db do
   end
 
   namespace :fixtures do
-    desc "Load fixtures into the current environment's database.  Load specific fixtures using FIXTURES=x,y. Load from subdirectory in test/fixtures using FIXTURES_DIR=z. Specify an alternative path (eg. spec/fixtures) using FIXTURES_PATH=spec/fixtures."
+    desc "Load fixtures into the current environment's database. Load specific fixtures using FIXTURES=x,y. Load from subdirectory in test/fixtures using FIXTURES_DIR=z. Specify an alternative path (eg. spec/fixtures) using FIXTURES_PATH=spec/fixtures."
     task :load => :environment do
       require 'active_record/fixtures'