Johnstown: America's Deadliest Flood

After a shark attack left surfer Todd Endris badly injured, a pod of dolphins surrounded him and helped him reach safety.

In 1971, meteorologist Tetsuya Fujita created the Fujita Scale, which allowed scientists to categorize tornadoes, aiding in predictive weather patterns. Fujita revolutionized the understanding of thunderstorms, tornadoes, hurricanes and typhoons.

Rachel Louise Carson was an author and marine biologist who wrote the book Silent Spring, which sparked the modern environmentalist movement by calling out the pesticide and chemical industry.

At first, hurricanes were given only women’s names—until some women protested and got storms named after men, too.