As hurricanes and other natural disasters ravage the world and the threat of nuclear war looms, it's hard to assess which risks for humanity are really the scariest right now. But one of the biggest threats out there is one of the oldest: infectious disease, which can emerge naturally or be human-made, as in a case of bioterrorism.

Software powered by artificial intelligence is better for cyberattacks than cyberdefense, says a founding member of Google's security team. Heather Adkins advised consumers not to put certain personal information in their email communications. A hack "can happen to anyone," Adkins said.