I’ve always wondered:
Why is there an E on top of the eye chart.
Why doesn’t the grape flavor taste anything like grapes?
Why can’t I just called a pre-owned vehicle used. After all, that is what it is.
What causes sonoluminescence?
Can we build a working quantum computer big enough to do things our PC’s can’t do?
Why is there an arrow of time; that is, why is the future so much different from the past?