Even new-fangled salt water systems can't quit chlorination.
The complicated, century-long relationship between swimming pools and chlorine
Old footage of sports events can help scientists track climate change
Cycling videos of the Tour of Flanders show how trees are responding to warmer weather.
The weirdest things we learned this week: artistic farts, meat lozenges, and Tesla's beloved pigeon
Our editors scrounged up some truly bizarre facts.
Why websites still break at the worst possible times
Even the mighty Amazon isn't immune from system failures.
The tanning bed in your gym is worrying dermatologists
How healthy is that ‘healthy glow’?
'Glider trucks' are pollution machines, but they might roll past EPA regulations
Old, inefficient engines inside new frames have been sneaking through a regulatory loophole that the EPA was supposed to be closing.
Cool your home without air conditioning
Strategies for chilling out.
Rising sea levels are going to mess with the internet, sooner than you think
Connectivity issues could get much worse.
A realistic guide to the current crop of tech rumors
Catch up on all the technology gossip without all the hype.
Sleep trackers probably won’t help you sleep any better
We know how sleep cycles work, but we don’t know what a normal one is or how to alter it.
Why this algebra teacher has her students knit in class
Knitting isn’t just for passing time.
China's super-sized space plans may involve help from Russia
Geologists think there could be a quadrillion tons of diamonds inside our planet
But we’ll never get them out of the ground.
Termites are nature’s most amazing skyscraper engineers
Their towers even have central air.
It's surprisingly easy for your headphones to damage your hearing
Here's how to check.
The truth behind 8 common misconceptions about drugs
Your spine doesn't store LSD, and MDMA doesn’t put holes in your brain.
Five rad and random things I found this week
The end-of-week dispatch from PopSci's commerce editor. Vol. 50.
This textile's twitching tendrils hint at a future of programmable materials
Responsive environments. No robots needed.
Here’s what you can do if your social media post gets taken down
You can appeal when your social media content gets taken down, but you need to know where to look.
Neptune, Titan, Jupiter, and Pluto look gorgeous in these new photos
A good week for space photography