Every 30 days, Matt Cutts gives himself a new challenge: writing a novel, giving up sugar, even chewing more slowly. He says 30 days is enough time to develop a habit or just make life more interesting.
Data Scientist Jeremy Howard has studied machine learning for 25 years. He says artificial intelligence can help achieve amazing things. But he warns the impact on jobs may cause a great deal of social instability.
When climate scientist James Hansen spoke up about climate change in the 1980s, he risked the loss of his job & reputation. But, he says, it was worth it — because he could not be silent about something so important.