• 02 The Vector Dot Product
http://qindex.info/i.php?x=5307

• youglish.com
A great next step is to go to youglish dot com. It's a collection of YouTube videos with subtitles and you can search for a particular word or phrase and then filter by American English.
http://qindex.info/i.php?x=10443

Google ➔ Dictionary ➔ Image ➔ YouGlish