useless trivia: What Word Means: A Chemical Compound Used In Bleaching Flour?

Questions

"Love is the triumph of imagination over -------------."- H. L. Mencken?

"The most incomprehensible thing about the world is that it is at all --------------."- Albert Einstein (1879-1955)?

"Throw your ---------- over the fence and the rest will follow!" - Norman Vincent Peale?

"-------- is nature's way of keeping everything from happening at once."- Unknown?

"The old believe everything, the middle-aged suspect everything, the young -------------------."- Oscar Wilde?