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I am why the sky is blue

And why we sleep at night.

I am why soap cleans your face

And sliced onions make you cry,

I am why your ice cubes float

And coffee keeps you sharp

But most of all I am why

Food tastes so good

And why love feels oh so fine.

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I am Hydrogen (H)

I am why the sky is blue

Sunlight collision with the air molecules in our atmosphere. The air is compound by other molecules and H2 http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html

And why we sleep at night.

Melatonin (C13H16N2O2) https://www.webmd.com/sleep-disorders/tc/melatonin-overview

I am why soap cleans your face

http://www.worldofmolecules.com/interactive_molecules/soap.htm

And sliced onions make you cry

Sulfuric acid (H2SO4) https://www.thoughtco.com/why-do-onions-make-you-cry-604309

I am why your ice cubes float

Hydrogen bonds in water (H2O) https://wonderopolis.org/wonder/why-does-ice-float-in-water

And coffee keeps you sharp

Caffeine (C8H10N4O2)

But most of all I am why

The most abundant element in the universe is hydrogen https://www.livescience.com/28466-hydrogen.html

Food tastes so good

Hydrogen ions https://www.scientificamerican.com/article/a-simple-sourness-detector/

And why love feels oh so fine.

Oxytocin (C43H66N12O12S2) https://io9.gizmodo.com/5925206/10-reasons-why-oxytocin-is-the-most-amazing-molecule-in-the-world

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    $\begingroup$ Welcome to Puzzling! Why don't you take the tour and earn another badge? $\endgroup$
    – boboquack
    Oct 17, 2017 at 20:55
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    $\begingroup$ Providing links to relevant information is fine, but you should include a summary of what that link says within the answer itself rather than just linking to it. See Your answer is in another castle: when is an answer not an answer? which covers why: links can go dead, or their content changed, and at best it's distracting having to go elsewhere to see what information you were trying to share. $\endgroup$
    – Rubio ♦
    Oct 17, 2017 at 20:58
  • $\begingroup$ @Elvio Martinelli What Rubio said. I hate to accept or otherwise respond to an answer if the answer isn't really an answer. Links are a big turn off in terms of representing the core of an answer. So....give it some editing and personal 'opinionating' and I will have another look $\endgroup$
    – Dr t
    Oct 18, 2017 at 15:49

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