H is for Hydrogen

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Seems I transposed the dates for H and I. We'll get back on track with J is for Jupiter tomorrow.

What is hydrogen? Hydrogen is a colorless, odorless, tasteless naturally occurring highly flammable gas, the chemical element of atomic number 1.
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The hydrogen atom is so simple and small, it is hard to believe that it is the most important and abundant substance in the universe. We are all byproducts of hydrogen as we can trace elements we are made up of back to nuclear fusion of hydrogen atoms in...