How Can Astronauts Tell How Fast They’re Going?
Weirdly, spaceships have no direct way to gauge their own speed. Luckily, we can use some physics tricks to figure …
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One Way or Another, Most of Our Electricity Comes From Solar Power
That’s good news, since the forecast is sunshine for the next five billion years.
You Can Approximate Pi by Dropping Needles on the Floor
Who needs a supercomputer when you can calculate pi with a box of sewing needles?
How Can a Locomotive Pull a Long Train That’s Much Heavier?
For railroads, it’s all about managing static and kinetic friction.