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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
There are more bacteria in your mouth than there are people in the world.