discovered
Wrong, it was invented.
Things that preexisted our awareness of them are discovered.
Things that did not exist until we created them are invented.
It was invented in1859.
it was invented when the earth was discovered
Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.Sigma notation was invented, not discovered.
Alessandro Volta invented the first battery and Gaston Planté invented the first rechargeable battery.
The first solar battery was invented in 1954.
It was not discovered but invented.
It was not discovered but invented.
They were not discovered, they were invented.
discovered
Discovered
It was not discovered it was invented.
it is discovered