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A secret, hypersonic replacement for the legendary SR-71 promises to transform military aviation

Climate Week's big pledges included preserving forests and investing in renewable energy. Now those promises need to be kept.

An idea that just might take off

Rapid manufacturing methods may eliminate dependence on Russian rockets

Popular Science is inside the U.N., where 150 heads of state are talking global warming. Will they put momentum behind an international treaty in 2015?

The European Union is reviewing a case of a deadly blood clot.

But you can still wear them if you want.

Are we ready for airplanes with no humans in the cockpit?

Scruffy's ancestors might come from Mongolia

If the idea of getting fitter doesn't motivate you to go to the gym, how about trimming your electric bill?

Well, probably, but how can you tell?

And how their value changed over time.

Colonial legacies within science are difficult to untangle, but the work is crucial.

Dozens of volunteer divers surveyed marine protected areas worldwide, to discover why life flourishes in some while failing in others.

It ain't just folded paper.

So much easier than counting on the ground

Take control of your internal clock.

The system is one way for militaries and others to deal with rogue drones. Pew, pew!

The relationship between people and their planet just isn't that simple.

A new book highlights the diversity of these fuzzy pollinators