Based on the article, which of these is true about George Nissen?
Nissen had an idea as a gymnastics coach and teamed up with others to train performers.
Nissen had an idea to become a pilot for the military and then became an astronaut.
Nissen had an idea and teamed up with others to make it a worldwide sensation.
Nissen had an idea to become a circus performer and then left his home to go on tour.
In 1930, 16-year-old George Nissen was attending a circus when an idea began bouncing around in his head. Watching the aerial performers fall from high up in the tent and land in the safety net below, he wondered if he could make something that would let them bounce back up. That idea led to his invention of the trampoline. And, with the help of a kangaroo, it became a worldwide sensation.
Starting that day at the circus, Nissen, a gymnast himself, set out to create a bouncy device. First, he stretched canvas across wood beams. When that failed, he tried again, and again. He spent years playing with different materials and even took apart his bed to try using its frame.
Finally, Nissen teamed up with his gymnastics coach. Together, they made the first successful model using scrap steel and inner tubes. In 1945, Nissen got a patent for his "tumbling device." He later changed the name to "trampoline," from trampolín, the Spanish word for "diving board."
Nissen started touring with his trampoline. It was a hit everywhere he went. By the 1950s, "jump centers" were popping up at gas stations in the United States. Kids bounced on trampolines while their parents filled up their cars. In 1960, a photo of Nissen and a kangaroo jumping on a trampoline spread around the world. That helped the trampoline become popular all over the globe.
The trampoline wasn't just a fun hobby for kids, though. From 1945 on, military pilots used the trampolines for training. The trampolines allowed them to practice adapting themselves to their surroundings after tricky in-flight moves. Soon, NASA started using trampolines for training astronauts, too. Nissen and astronaut Scott Carpenter invented a game played on the trampoline that conditioned astronauts for space travel.
Nissen's trampoline was a game-changer for Earth-bound athletes, as well. Nissen helped create trampolining, a sport that combines acrobatics and bouncing, which became an Olympic event in 2000. In 2008, Nissen himself tested the trampoline at the Olympic games in Beijing. That was 78 years after the day he first decided to take a leap.