What-if-XKCD is a site where randall munroe, the person who does the xkcd comics, answers strange science questionsLol I've known about XKCD for a few years but I have known about What If? for only about 2 months
last weeks: What would happen if you tried to hit a baseball pitched at 90% the speed of light? (http://what-if.xkcd.com/1/)
this weeks (although i thought last weeks was better): What if everyone who took the SAT guessed on every multiple-choice question? How many perfect scores would there be? (http://what-if.xkcd.com/2/)