Nikola Tesla was the most popular scientist of the 19th century, more popular than Edison. In fact, Tesla worked with Edison in the 1880s but had a falling out because he believed Edison stole his ideas. Tesla developed AC power used all over the world now and worked with George Westinghouse to promote it. He laid the foundation for radio, TV and many modern inventions. He fell into insanity & became a recluse. He died in poverty in a tiny apt'mnt, by then considered a "mad scientist" in 1943.
Scientist Rosalind Franklin made the first clear X-ray images of DNA’s structure. Her work was described as the most beautiful X-ray photographs ever taken. Franklin’s ‘Photo 51’ informed Crick and Watson of DNA’s double helix structure for which they were awarded a Nobel Prize. Franklin died of ovarian cancer in 1958, aged 37, her contribution to DNA’s discovery story unacknowledged.