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Best science pun you know (for shirts)?

I kinda need really good ideas. I don't care if they already have it in shirt prints or not. So give me your best shot please :D
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Picklebobble2 · 56-60, M
Potassium went on a date with Oxygen.
It went OK

An optimist sees a glass half full
A pessimist sees a glass half empty
But only a chemist knows a glass is full
Half liquid, half air.

A proton checks into a hotel and the clerk asks if he has any luggage.
The proton replies "No i'm travelling light"
Casheyane · 31-35, F