We know that even a grain of dust or tiny droplet can damage a tough metal surface if the particle gathers up a high-enough speed when it smashes into it. But until now there’s been a problem figuring out how or why that damage happens. That’s because the speed has to be really freaking high,
Atomic clocks, based on the minute oscillations of atoms, are the most precise timekeeping devices humans have created. Every year, scientists make adjustments that improve the precision of these devices. Now, they’ve achieved new performance records, making two atomic clocks so precise they could detect gravitational waves, those faint ripples in the fabric of space-time.
Well, general relativity is still holding firm. According to a new test of Einstein’s venerable theory, our Universe’s gravity isn’t leaking into other dimensions. We are all very relieved to hear that our gravity isn’t going to disappear into some weird dimension we can’t even comprehend, obviously – after all, there are a slew of