Brain Teasers

1. Can Action be possible without Reaction.
2. Is there any limit of pain, beyond that limit a person may die?
3. Who is your brother's father's son?
4. Every disease has its symptoms like T.B has cough,headache etc. Can this be cure by mixing headache and cough medicines?
If not then y?
5. Fire, water, air which one is the strongest??
6. Sun rises in east and set in west. What will happen if it rises in North and Set in south?
7. Telling a lie is a sin, is it crime also??
8. Husband is driving a car his wife is sitting exactly behind him. She is pregnant. Her baby should be alive.  A killer have 15 min to kill his wife or he will be dead. There should neither be any doubt on killer nor his wife can see killer before he get kill and her Son should be alive. Give me plain.
9.  Is there any device to measure the intensity of "Pain". If not then why?
10. Why not elephant drown in the water but a person do?