"He" is the chemical symbol for Helium.
Helium is the second simplest element.
Helium is a "rare" or "noble" gas.
When inhaled, helium leads to a high pitched voice.
Helium is stable and lighter than air. Two properties which make it the natural choice for filling balloons.
Helium can be supercooled down to a few millionths of one degree.
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