来自MSN2 个月
The wonder material which could hold the key to near-limitless energy
I'm watching a black disc of wonder material hovering over a bubbling bath of liquid nitrogen. "This is superconducting magnetic levitation," says magnet scientist Greg Brittles. "The closest you ...
来自MSN11 个月
Liquid nitrogen fertilizer spill kills nearly 750,000 fish in Iowa river, officials say
About 1,500 tons (equal to 265,000 gallons) of liquid nitrogen fertilizer (32% solution) was released into a drainage ditch, which subsequently entered the East Nishnabotna River. The spill ...