Stately corpses of bristlecone pine trees, some dead for 2,000 years but still refusing to lie down, stood watch last week as botanist Ann Dennis and a crew of naturalists stepped off plots on the ...

In the 1960s, America explored space with rockets—but Project HARP tried a different approach: using a massive gun. This High Altitude Research Project aimed to reach orbit more cheaply. Designed by ...

When most people hear about high-altitude platforms (HAPs), they think of intelligence, surveillance, and reconnaissance. And for good reason: defense investment and headlines have long revolved ...