Live Science58 分钟
Boom Supersonic's next-generation XB-1 passenger plane 1 step away from breaking the sound ...
Boom Supersonic's XB-1 demonstrator craft could become the first commercial jet to break the sound barrier since Concorde ...
Ultra-fine dust to engulf most of South Korea until Thursday (Jan 23)
SEOUL: Most of South Korea was covered by thick, ultra-fine dust for the second consecutive day on Wednesday (Jan 22), with ...