Tiny sensor tells you when your favorite places are crowded
 

You probably aren't a fan of showing up at the coffee shop right when there's a large line, or at the gym when there are no free machines. Wouldn't it be nice if you could find out how busy a place is at any given moment, without resorting to esti...

http://www.engadget.com/2015/08/01/d...cid%3Drss_semi