Put Your Scientific Knowledge to the Test!

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What does the H stand for in the chemical formula H2O?

Helium

Hexagon

Hydration

Hydrogen

Dental fillings have a long history. Archaeological findings in Slovenia show that 6,500 years ago, cavities were filled with beeswax.

Dental fillings have a long history. Archaeological findings in Slovenia show that 6,500 years ago, cavities were filled with beeswax.