San Francisco becomes first US city to allow police robots to kill suspects
"Robots equipped in this manner would only be used in extreme circumstances to save or prevent further loss of innocent lives"
World’s 1st hydrogen-powered jet engine seeks turning point for aviation industry
A second round of tests on the engine is currently being planned
Copper’s biggest mystery is finally cracking
In what could prove a game changer for global supply, a US startup says it’s solved a puzzle that has frustrated the mining world for decades