Robert Hooke.
There were a number of scientists, but when people talk about "the two" they usually mean Francis Crick and James Watson. They, with Maurice Wilkins, received a Nobel Prize for their work.Although a number of noted scientists played a part in the discovery.
the scientist Schielden is known for discovering the plant cell
A scientist cannot be made responsible for his discoveries anymore than an explorer can be made responsible for his discoveries. In both cases the thing discovered was always there, it just needed someone to find it. Also if that scientist or explorer chose to withhold his/her discovery for fear of what might come of it, there is nothing to keep another person from discovering it too.
Karl Wilhelm
Marie Curie
Isaac Newton
observing, experimenting and discovering
Madame Marie Curie was a scientist, and she was known for discovering a few chemical elements. One of them was polonium, which was named after her native country.She dealt with radiation and radioactive things, and ended up discovering the element thoruim was radioactive.
observing/experimenting and discovering
Karl Wilhem is given credit for discovering simple machines
Karl Willhelm, a Swiss Botanist