Championed the heliocentric model — that the Earth revolves around the sun — based on his telescope observations. The Catholic Church considered this heresy. In 1633, the Roman Inquisition found him “vehemently suspect of heresy,” forced him to recant, and sentenced him to house arrest for the rest of his life. He spent his final 9 years confined to his villa, going blind, and died in 1642 still under the Church’s condemnation. It took the Vatican until 1992 — 350 years — to formally acknowledge they were wrong.

Developed his heliocentric theory over decades but refused to publish it because he knew the backlash would be devastating. His book De Revolutionibus was finally published in 1543 — legend has it that a copy was placed in his hands on the day he died. He literally waited until he couldn’t face the consequences to release his life’s work.

Proposed continental drift in 1912 — the idea that the continents were once connected and had slowly moved apart. Geologists ridiculed him for decades. He was a meteorologist, not a geologist, and the establishment dismissed him as an outsider who didn’t understand the field. He died in 1930 on an expedition in Greenland. Plate tectonics wasn’t accepted by the scientific community until the 1960s, more than 30 years after his death.

Championed alternating current (AC) as the future of electrical power distribution. His former employer, Thomas Edison, ran a vicious public campaign against AC — including publicly electrocuting animals to “prove” that AC was deadly dangerous. Edison called it “the executioner’s current.” Tesla was right. AC became the global standard for power distribution. Tesla died alone in a New York hotel room in 1943, largely broke, feeding pigeons in the park.

Published Silent Spring in 1962, warning that pesticides like DDT were devastating ecosystems and endangering human health. The chemical industry mobilized against her immediately. They called her hysterical, unqualified, and a communist. Monsanto published a parody of her work. Industry groups questioned her credentials as an unmarried woman, implying she was emotionally unstable. She testified before Congress while privately battling breast cancer. She died in 1964, two years after publication. The EPA was created in 1970 largely because of the movement her book started. DDT was banned in 1972.

In 1854, during a cholera outbreak in London, Snow traced the infections to a single contaminated water pump on Broad Street. The prevailing theory at the time — “miasma,” the idea that disease came from bad air — was dominant, and the medical establishment refused to take him seriously. Snow removed the pump handle himself. The outbreak stopped. But the medical community still didn’t accept waterborne disease theory during his lifetime. He died in 1858 with his work largely unrecognized. Germ theory eventually proved him right.

Patterson was a geochemist at Caltech trying to determine the age of the Earth using lead isotope dating. He kept finding lead contamination in everything — his equipment, his samples, the air, the water, the dust. He realized that industrial lead from gasoline was poisoning the entire environment. When he published his findings in 1965, the Ethyl Corporation — a conglomerate backed by General Motors, Standard Oil, and DuPont — came after him. Their chief medical advisor, Robert Kehoe, had spent 40 years building the scientific case that leaded gasoline was safe, funded entirely by the lead industry. Kehoe held an almost complete monopoly on lead-safety data for half a century. Ethyl allegedly offered to endow a chair at Caltech if they fired Patterson. His contracts with the U.S. Public Health Service were not renewed. He was removed from government panels and denied funding from supposedly neutral research organizations. Patterson fought them for 20 years. He built one of the first clean rooms in history to produce uncontaminated data. He compared lead levels in modern humans to 1,600-year-old Peruvian mummies and found a 700- to 1,200-fold increase. His work eventually led to the phaseout of leaded gasoline under the Clean Air Act. After the ban, blood-lead levels in Americans dropped by 80%.

By the early 1950s, McClintock was already one of the most accomplished geneticists alive. She had been elected to the National Academy of Sciences at 42 — only the third woman ever — and was the first female president of the Genetics Society of America. Then, in 1951, she stood up at the Cold Spring Harbor Symposium and presented her discovery that genes could move positions on chromosomes. This was heresy. The central dogma of genetics held that genes were fixed in place like beads on a string. When she finished her talk, there was dead silence. She later described the reaction as “puzzlement, even hostility.” Colleagues couldn’t follow her abstract presentation style, and the findings were so far ahead of the field that most geneticists simply didn’t have the framework to understand them. Over the following years, she continued publishing papers supporting her findings and was continually ignored. She had also aligned herself with a theory proposed by the contrarian geneticist Richard Goldschmidt — and was dismissed by association, even though Goldschmidt was wrong and she was not. Eventually she stopped publishing and lecturing on the topic altogether. She wrote in 1973: “It is difficult if not impossible to bring to consciousness of another person the nature of his tacit assumptions.” She kept doing the research quietly at Cold Spring Harbor for decades. When molecular biology finally caught up and confirmed transposable elements in the 1970s, the field realized she had been right all along. She won the Nobel Prize in Physiology or Medicine in 1983, at the age of 81 — more than 30 years after her original presentation. She said: “If you know you are on the right track, if you have this inner knowledge, then nobody can turn you off.”

In the early 1980s, Marshall and his colleague Robin Warren proposed that stomach ulcers were caused by a bacterium, Helicobacter pylori — not by stress, spicy food, or excess acid, as the medical establishment had believed for decades. Gastroenterologists ridiculed them. The pharmaceutical industry had a massive financial incentive to keep selling acid-suppression drugs. Unable to get anyone to take him seriously, Marshall drank a petri dish of H. pylori bacteria in 1984 to prove his point. He developed gastritis within days, biopsied his own stomach, and demonstrated the bacteria were the cause. Even after that, it took over a decade for the medical community to fully accept the finding. He and Warren won the Nobel Prize in Physiology or Medicine in 2005 — more than 20 years after the initial discovery.

In 1847, Semmelweis was a young Hungarian physician working in the maternity ward of Vienna General Hospital. He noticed that the ward staffed by doctors had a death rate from childbed fever five times higher than the ward staffed by midwives. The difference: doctors were performing autopsies on cadavers and then delivering babies without washing their hands. When Semmelweis instituted a hand-washing policy with chlorinated lime, the death rate plummeted from over 10% to under 2%. The medical establishment rejected his findings. Doctors were offended by the implication that they were killing their own patients. Semmelweis was fired. He was mocked. He grew increasingly erratic and outspoken. In 1865, he was lured to a mental institution, where he was beaten by guards and died within two weeks — possibly from an infection, the very thing he’d spent his career trying to prevent. Germ theory, validated by Pasteur and Lister, proved him completely right within a few years of his death.