The clearest black hole collision ever recorded just confirmed Einstein—while raising hopes that the next one might rewrite the laws of gravity. Credit: Shutterstock For scientists who track faint ripples traveling through the cosmos, GW250114 stands out. It is the clearest gravitational wave signal ever recorded from a pair of merging black holes, giving researchers an unusually sharp tool for testing Albert Einstein's theory of gravity, called general relativity. "What's fantastic is the