Space Exploration Technologies Corp., trading as SpaceX, is an American aerospace manufacturer and space transportation services company headquartered in Hawthorne, California. It was founded in 2002 by Elon Musk with the goal of reducing space transportation costs to enable the colonization of Mars. SpaceX has developed several launch vehicles, the Starlink satellite constellation, and the Dragon spacecraft.
SpaceX's achievements include the first privately funded liquid-propellant rocket to reach orbit (Falcon 1 in 2008), the first private company to successfully launch, orbit, and recover a spacecraft (Dragon in 2010), the first private company to send a spacecraft to the International Space Station (Dragon in 2012), the first propulsive landing for an orbital rocket (Falcon 9 in 2015), the first reuse of an orbital rocket (Falcon 9 in 2017), the first private company to launch an object into orbit around the Sun (Falcon Heavy's payload of a Tesla Roadster in 2018), and the first private company to send astronauts to the International Space Station (Dragon 2 in 2020). SpaceX has flown 20 cargo resupply missions to the International Space Station (ISS) under a partnership with NASA, as well as an uncrewed demonstration flight of the human-rated Dragon 2 spacecraft (Crew Dragon Demo-1) on March 2, 2019, and the first crewed Dragon 2 flight on May 30, 2020.
The Riemann Hypothesis
Today's mathematicians would probably agree that the Riemann Hypothesis is the most significant open problem in all of math. It's one of the seven Millennium Prize Problems, with a million dollar reward for its solution. It has implications deep into various branches of math, but it's also simple enough that we can explain the basic idea right here...