Screaming Penguin - Source Does Matter

Smart goggles easy on the eyes

"When you're swimming, remembering how many lengths you've swum can be hard. I know that when I used to swim, I would trick myself into thinking I'd done 25 laps when maybe I'd only done 20," she says.

Man I know, hate when that happens. I swim 25 laps every decade and its almost impossible to remember when the last time I swam the last lap was, or what the count is ;). On a more serious note this is a very promising invention, pretty cool stuff.