useless trivia: What Word Means: A Blast Furnace?

Questions

Dogs can hear _______ that humans cant?

Men are 6 times more likely to be struck by _______ than women?

It is estimated that millions of trees in the world are accidentally planted by _______ who bury nuts and then forget where they hid them?

Ernest Vincent Wright wrote a novel, "Gadsby", which contains over 50,000 words -- none of them with the letter?

A toothpick is the object most often _______ on by Americans?