Brain Teaser – 5 November 2025

Two scientists walk into a bar. One asks for H2O, then the second asks for H2O, too. 

One of them dies. Why?

The second scientist dies. Both asked for water, but the bartender thought the second scientist asked for H2O2 (because he said H20, too). H2O2 is actually hydrogen peroxide, which is deadly when ingested.

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