Answer: Immunity
Answer: A prickle
Answer: Hydrogen
Answer: False
Answer: 99%
Answer: The black widow
Answer: A perfect number. You might also think of a perfect number as a number that is half the sum of all of its positive divisors, including itself! This definition is at least 2300 years old as it appears in Euclid's "Elements".
Answer: Neptune
Answer: 9,000
Answer: Sir Isaac Newton
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