Ponies of Science - Microbiology

This was actually what inspired the series. It was Rarity's Hazmat suit in "Bats!" (4x07) that got the ball rolling. Some of you guys said geology, which I didn't think of, but I like Rarity in a Hazmat suit. But really, geology would've been better. I might do an addendum. The Ponies of Science series: The Mane Six Representing Six Non-Exclusive Fields of Science!