An informative Q&A with the leader of Khan Academy about the potentials and perils of artificial intelligence.

Short-term memory is finite and fills up quickly. Here are 7 ways we can free up space for clearer-headed mathematical ...

Lateral-thinking puzzles fall into the latter category. Among the trickiest riddles out there, these brain games will give your noggin a serious workout. That’s because they’re not as clear-cut as ...