In my recent post about calculating the speed of light, I mentioned Ole Roemer's calculation in 1676. The basic idea uses the orbit of one of Jupiter's moons. The orbital period is constant, but there ...

In the week after Easter, we had a lot of old Peeps lying around. No one seemed that interested in eating them, so we used them to measure the speed of light. For centuries the speed of light was an ...

If you’ve ever been on a road where the speed limit feels artificially low or surprisingly high, you’re not alone. For decades, many states have leaned on a single formula to decide how fast cars ...