Do You Know?
1. Flies are difficult to swat because they are so much quicker than us. But can't we move so slowly that a fly can't detect the movement and actually get it? 
2. Genetically, who are we closest to -- our parents, our chidren, or our siblings?
3. How do electric eels get their energy?
4. Why is there such a big `gap' between Mars and Jupiter? There is an asteroid belt, but why did no planets form there?