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The US Navy is turning its nuclear attack submarines into underwater drone motherships. It took 3 tries to get here

For more than a century, everything fired from a submarine's torpedo tubes was built to leave and never come back. Launching ...
C&EN

How can we fuel visits to Mars?

We don’t need any advanced propulsion to get to Mars,” says Robert Zubrin, founder of the Mars Society and the astronautical engineering company Pioneer Astronautics. “We can do it with chemical ...