A student comes to a young professor’s office hours. She glances down the hall, closes his door, kneels pleadingly.

“I would do anything to pass this exam.” She leans closer to him, flips back her hair, gazes meaningfully into his eyes. “I mean…” she whispers, “…I would do…anything.”

He returns her gaze. “Anything?”

“Anything.” she states.

His voice softens. “Anything??”

“Absolutely anything.”

His voice turns to a whisper. “Would you…study?”

Don’t look at anything in a physics lab.
Don’t taste anything in a chemistry lab.
Don’t smell anything in a biology lab.
Don’t touch anything in a medical lab.

and, most importantly:

Don’t listen to anything in a philosophy department.

If you enter a college laboratory and see an experiment, how do you know which class it is?

If it’s green and wiggles, it’s biology.
If it stinks, it’s chemistry.
If it doesn’t work, it’s physics.