Be Afraid. Be Very Afraid.

Here are a few of the existential threats I'm thinking about this holiday season:

• AI (Artificial Intelligence): Will deep-learning computers and other forms of AI become so smart that humans are rendered obsolete? And what exactly is transhumanism?
• Islamic Jihadism: Entire school systems are closed by a single email. People eye their neighbors with renewed suspicion. Close the borders! Close the mosques! Close our minds to any hint of rational thinking!
• Global Warming: Yes, I know the Northeast had one of its coldest, snowiest winters ever this year. But now it is really warm. And the oceans are rising. What about the beleaguered reefs off Australia?
• Ebola and Other Pandemics: Everyone likes a good movie about killer germs. Will the people against childhood vaccinations change their minds?
• Republican Candidates for President: Be afraid. Be very afraid.