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 Paul 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!]