For most of human history there have been few people who have been considered geniuses. There was Leonardo de Vinci, and Isaac Newton who both changed the world in their time. For the modern era, few names reign higher on the genius scale than Albert Einstein. By the time he was thirty, Einstein had already changed the way science looked at the world in dramatic ways. Much of today’s modern technological breakthroughs can be traced directly to the work done be Einstein at the beginning of the last century. But no one is perfect, not even Einstein and he was wrong on a few things.
Einstein knew that gravity could bend light and that one way to test it would be to observe the light coming from a distant star as it passed near the sun. The sun’s gravity would bend the light and make the star appear in a different position than where it really is. Einstein performed the calculations which would have been shown in error had not the experiment been delayed. By the time the experiment was actually done, Einstein had revised his calculations to show the correct results.
The recent confirmation of gravitational waves was something predicted by Einstein’s equations back in 1915. Ironically, Einstein himself didn’t believe that gravitational waves could exist. In fact, Einstein once wrote a paper arguing that gravitational waves don’t exist. The paper was sent back for revisions which outraged Einstein. It was later shown that Einstein had indeed made an error about gravitational waves.
Today it is common accepted knowledge that the universe we live in is expanding. Einstein did not believe in an expanding universe and instead argued that the universe was in a steady state. Many years later Einstein admitted that he had been wrong about the universe.
Even though Einstein was wrong a few times in his life, he was right about the most important things. All those things he was right about changed the world.