Explain the history of computing device of magnical era​

Explanation:

Mechanical Era

It is a mechanical device that can be used as an aid for performing mathematical calculation. It was first used between 1000BC to 500 BC in ancient China Egypt etc. to count the cattle. The first Abacus was believed to be made with flat stone covered with sand or dust later on it was made from wood.

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d