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And the larger of the black holes was a rotating opposite of its partner, and that's never been seen before. And scientists think that the larger black hole in each merger coalesced in a process that would occur in dense environments like star clusters, where black holes would often come fairly close to each other. And along with what scientists believe are a second generation black hole, the mergers also validated the laws of physics predicted by Albert Einstein. The resulting signature from the gravitational waves matched up with the theories of Einstein and Roy Kerr, which concerned rotating black holes. Roy Kerr, he was a mathematician. He came up with what's called the Kerr solution. And it's an exact solution to Einstein's field equation of general relativity. And that basically describes space time around rotating uncharged black holes. Most black holes are expected to be at nearly neutral charge. A significant charge would cancel out during the, due to the accretion by the particles that are circling around the black hole. So black holes are basically dropped to have no charge at all.