Which scientist designed the first practical electron microscope that allowed researchers to see objects 400x smaller than optical microscopes could detect?

The development of scientific instruments has revolutionized how we observe and understand the world. Behind many groundbreaking discoveries are innovative product designs that pushed technological boundaries. This poll tests your knowledge about a pivotal moment in scientific product design that changed an entire field of research.

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Ernst Ruska (1931)
Richard Feynman (1947)
Linus Pauling (1939)
Rosalind Franklin (1952)