Hands-On Python Deep Learning for the Web

Duolingo 

Learning a new language has always been a tough feat. When Duolingo came onto the market in 2012, it brought with it a term that was beginning to grow in importance and scope—artificial intelligence. They converted something as mundane as memorizing words and grammar rules into minigames that would respond differently to each user. The Duolingo AI took into account the temporal nature of the human mind. They formulated research on how quickly a person is likely to forget the words he/she has learned. They called this concept half-life regression and used it to reinforce the knowledge of the words it predicted that the user would have forgotten at any given point of time. 

This worked immensely in their favor and made Duolingo one ...