The Brainiac video purports to show the explosions of alkali metals - rubidium and cesium - in a bathtub partially filled with water. The explosions are faked. They're bull-pucky.
There is an honest video - I think - of the alkali metals going into water thanks to World of Chemistry and Roald Hoffman.
There are also videos from Periodic Table of Videos from the University of Nottingham that go through information - not just the explosions in water - of the alkali metals.
The above video explains why the Brainiac videos are faked from a thermodynamic basis.
Don't trust the internet, folks.
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