Newton – gravity pioneer" who discovered the force of gravity more than 350 years ago. During this time, science has advanced far ahead, but knowledge in this area is not very increased. What have you learned about gravity after the child told you about this phenomenon parents? In the best case learned how to calculate its formula.
Gravity is very difficult to study because it is pervasive. It not only keeps us on the Earth's surface, it is like glue for the entire Universe. And she is so weak (weaker than electromagnetism is 10^40 times) that to study it in the lab just pointless. But thanks to her people and cows don't fly.