[astrange]

Washing your hands in the bathroom is an example of using biology at work. Only recently doctors would refuse to do it before surgery because nobody could explain what it did, so it wasn’t logically correct to do it.

[xigoi]

Do you need to memorize the names of various bacteria in order to see that your hands become less dirty when you wash them? No.

[astrange]

But you need to know how aerosol transmission works to know why disposable towels are cleaner than hand dryers.