Important update, Jan. 17 at 18:00 UTC: There have been a lot of objections raised about the video mentioned below and the way I describe the math therein. It’s more than I can simply add or update ...

Here's a fun math puzzle to brighten your day. Say you've got four 4s—4 4 4 4—and you're allowed to place any normal math symbols around them. How many different numbers can you make? According to the ...