21:19

The Chemistry of Fire

26:16

Can you GROW an Opal?

26:24

What is a Unit Cell?

19:58

How DO Molecules Store Energy?

21:34

What ARE atomic orbitals?

23:38

How Do Chemical Reactions REALLY Happen?

34:55

Complete History of the Avogadro Number

23:34

What IS activation energy, really?