You use it everyday but let it rest at night. It has an identical twin beside it all the time. For some reason you always cover it up. It is not alive but it has have a soul. What is it?
A thing which is Live ,as we use it Everyday for watching this Beautiful Nature,and has high auto-focusing strength!!! so what is it??
What is closed during the day, and open at night. But you can always use it.
Let ABC be an equilateral triangle. Let P be any point on its incircle. Prove that:
AP2 + BP2 + CP2 = k for some constant k
The Pope has it, but he does not use it; your father has it and your mother also uses it; some change it, some don't; the nuns do not need it. What is it?
