In the early 2000s, when police began buying the stun guns in significant numbers, Taser International marketed them as a “non-lethal” or “less lethal” alternative for controlling ...
Researchers at the University of Cambridge have built a solar-powered reactor that converts atmospheric carbon dioxide (CO2) into a gas that could one day fuel vehicles, power off-the-grid ...
当前正在显示可能无法访问的结果。
隐藏无法访问的结果