Does hot water freeze slower than cold water?
Half-True- Hot water can freeze faster than cold under some conditions, but not always, and nobody has explained why.
Could a penny dropped from a skyscraper kill someone?
False- A penny is too light and flat to kill somebody, by falling of a building.
Are no two snowflakes ever alike?
Half-True — complex snowflakes are extremely unlikely to match exactly, but simple ones can look alike
Lightning never strikes the same place twice
False — lightning strikes the same spots again and again, especially tall or pointy structures.