Relative pronouns

There is a scientist ____ found a solution to the problem

Joshua Silver invented glasses ___ don't need an optician.

Silicon valley is a place ___ many successful technology companies like Apple are based.

Louis Agassiz had a son, Alexander, ___ main interest was mining.

Concorde was the first commercial airplane ___ flew at supersonic speed.

Hedy Lamarr was a woman ___ was famous as an actress in the 1940s.

The Hubble telescope in space can see place ___ no one has ever been.

Einstein was a scientist ___ changed the way we think.

The astronomer William Herschel had a sister, Caroline, ___ research contributed to his discoveries.

In 1800 Alessandro Volta built a machine ___ was the first battery.