Here’s where things got really confusing. Going into Mingle, there were 72 players because two people were eliminated during ...

1. Fast and Slow Piles. This works well as a starting or closing activity. Students sort math fact cards into fast and slow piles. This visual way of tracking facts highlights which facts come ...

An apparently easy-looking math problem has left internet users scratching their heads. Give it a try to see if you can ...

Subscribe to Scientific American to learn and share the most exciting discoveries, innovations and ideas shaping our world today.

The primary trust fund that supports Social Security is expected to run out of money in 2033. If Congress doesn’t adjust the ...