Maybe it's because of Breaking Bad, but lately I'm fascinated by chemistry. I wish I had a teacher as cool as Michigan State University professor Peter Hunter when I was in high school. Watch him demonstrate these amazing reactions on video.
Professor Hunter demonstrated them last year to high school students — after their tests for the Chemistry Olympiad Competition. He's awesome. Sadly, he died last month in a car accident after a medical emergency. Rest in peace, professor. [Thanks Roger!]