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The Fermi Paradox â€" Where Are All The Aliens? (1/2)
The universe is unbelievably big â€" trillions of stars and even more planets. Soo… there just has to be life out there, right? But where is it? Why don't we see any aliens? Where are they?...

Published: 06-05-2015
Duration: 6:22
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Introduction to the atom | Chemistry of life | Biology | Khan Academy
The atom, proton, neutron and electron Watch the next lesson: https://www.khanacademy.org/science/biology/chemistry--of-life/electron-shells-and-orbitals/v/orbitals?utm_source=YT&utm_medium=Desc&u...

Published: 26-08-2009
Duration: 21:5
Definition: sd
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