National Security Journal on MSN

SR-72: The Air Force’s New Hypersonic Bomber?

The SR-72 “Darkstar” is envisioned as a Mach-6, air-breathing ISR platform—but could it strike? -Hypersonic speed complicates ...

Large brains require warm bodies and big offspring in vertebrates, study finds

Vertebrates have extremely different brain sizes: even with the same body size, brain size can vary a hundredfold. As a rule, ...