Rivers May Have Operated On A Global Scale Around 3.5 Billion Years Ago

The new find comes courtesy of ancient rocks in China and South Africa.

- HRITHIK KIRAN BAGADE

The Cold War was an era of suspicion and high-tech espionage. It was a time when the United States of America and the Union of Soviet Socialist Republics had spies on the ground and had deployed the most modern spying technology of the time. One aspect that stood out was the US's spy-tech high up, at 80,000 feet in the stratosphere. Its purpose was to photograph the Soviet Union's secret nuclear sites and military build-up, and the solution to this job, "undetected," was the Mach-3+ Lockheed SR-71 Blackbird, one of the first aircraft with stealth technology—a revolutionary innovation in aircraft design. This reconnaissance aircra