A few minor corrections (part 2)
1)
2)
3)
Lightning can strike multiple times in the same place. The Empire State Building is typically struck several times in a storm.
4)
5)
6)
Money Matters:
7) (not a correction)
8)
The (physically) smallest US coin ever made was the silver three-cent piece. A larger nickel three-cent piece was also produced.
9)
The lowest-denomination US coin ever produced was the half-cent piece. It was produced until 1857.
10)
11)
The nickel was created in 1866 to replace the half-dime, but they coexisted for several years.