The Facebook CEO wants to change the world, not just the Internet

A new report from tech blog Gizmodo alleges that Facebook's Trending feature is curated by humans, some of whom bury content from conservative news outlets. (Facebook denied the report, saying it has "rigorous" neutrality policies.) Here are answers to key questions.

He says the country is too dangerous

Ancient tool is older than scientists originally thought

The ads prey on the poor and economically vulnerable, critics say

People are growing more accepting of airline fares and fees