By using clocks that pretty much define "hyper-accurate", scientists have demonstrated relativistic effects on Newton-level scales. I'm old enough to remember when many people thought Einstein's theory was too wacky to actually be true, mostly of the fundamentalist Christian bent. I wonder if they realize the GPS unit that guides them to their (now) grand-kid's birthday party at the local Chucky's wouldn't work at all if it weren't for Einstein's relativity theories?