Ten Difficult Questions

1. Why is the sky blue?
2. How do birds fly?
3. Why do things fall? (even though Einstein's theory of gravity cannot be reconciled with quantum mechanics?)
4. Why do some things break when they fall?
5. How does the sun shine? (and produce so few solar neutrinos in the process?)
6. What will the weather be like tomorrow?
7. Where do babies come from? (and look the way they do?)
8. Why do people die?
9. Why do things cost so much? (especially after currency crises like in East Asia?)
10. Why is the computer taking so long? (because P is not equal to NP?)