Why brain was protected with hard skull

New research shows that, as with muscles, the more you use a part of your brain, the larger it will get. London taxi drivers have very large hippocampi - the part of the brain that deals with spatial mapping. Also like muscles, as you use a particular part of your brain, more blood is pumped to that area to provide energy. Finally, as with muscles, the more you use your brain, the better it works.

Yes they are correct good day