Friday links

Weird Al Yankovic as Isaac Newton in this historical rap battle vs. Bill Nye.

Physics, the World Cup, and Bouncy Balls.

Scientific invention du jour: Chinese hospitals introduce hands-free automatic sperm extractor.

Video supercut of the classic Star Wars line "I am your father" in 20 languages, bonus Star Wars: The Musical.

It's hard to imagine why, but dating site uses facial recognition to find matches that look like your ex.

If you’re a math geek who doesn’t like sharing, you’ve been cutting cake wrong your whole life.

ICYMI, Tuesday's links are here, and include honest Disney posters, report cards of famous authors, and 18th- and 19th-century patent models.