Open problems: questions no one knows the answers to
- What is dark matter?
- What is dark energy?
- What is the interpretation of gravitational solitons? How are they connected to black holes?
- What is consciousness?
- Why do we sleep?
- How does the radiation emitted by a charge affect its dynamics? (this is the problem of radiation-reaction).
Interesting questions we know the answers to
- Why is the sky blue?
- Why does salt water fail to satisfy thirst?
- Why does water stay in a straw when you put your finger on it?
Here is an interesting TED talk by Chris Anderson about questions no one knows the answers to: