Amazing facts you need to know

Do you know that:

1. Octopus has four hearts while we humans have just one
2. While it rains water in our planet earth, it rains diamond in planet jupiter
3. Out of 100% of the universe, only 25% is known while the remaining 75% is refered to as dark energy because its unknown by even scientist.
4. There are fishes that excrete sand as there waste product into the sea bed.