Best friends confess their most intimate money secrets

These five pairs of best friends reveal everything from student loan debt to dating for free meals.

19-year-old Mark Zuckerberg: 'Issues about violating people's privacy don't seem to be surmountable'

Before Zuckerberg dropped out of Harvard to launch Facebook, he ran the site Facemash. He shut it down, citing privacy concerns: "I'm not willing to risk insulting anyone," he said at the time.

'The Blob': This mysterious 'smart' slime can solve puzzles and make decisions

Physarum polycephalum, aka "the blob," is on display at the Paris Zoological Park now through Nov. 3. It's a slime mold that's capable of moving, making decisions and regenerating, all without a brain and nervous system. Here's why this mysterious mold's capabilities could have practical uses too.