'H' in Science

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Can you name the answers to these science questions?

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What portion of the brain is responsible for most activities of the automatic nervous system?
After which American astronomer is the telescope launched by Challenger in 1990 named?
What is the generic name for the non-metallic elements in Group 17?
In what unit is frequency measured?
What psychological disease is characterized by excessive preoccupation or worry about being sick?
Baryons and mesons are the two families of what quark-comprised composite particles?
What term refers to an organism that eats only plants?
Whose uncertainty principle states that one can either know the location or velocity of an electron, but not both?
What term signifies a substance that lacks uniformity in composition or character?
What term refers to the period over which a substance decays by 50%?
The Mohs Scale, ranging from Talc (1) to Diamond (10), measures what information about a mineral?
What term refers to the amount of water vapor present in the air?
What term refers to the property of a system that regulates its internal environment, remaining stable?
The first step in the scientific method is to form a what, which is often an educated guess?
What theory, pioneered by Nicolaus Copernicus, stated that the sun was the center of the solar system?
What element is first on the Periodic Table?
What astronomical entity is visible from Earth every 76 to 77 years?
Andrew, Ike, and Katrina are names of what meteorological phenomena?
What process comes from the Greek for, literally 'separation by water'?
What hypothetical elementary particle is used to explain spontaneous breaking of electroweak symmetry?

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