SpaceNASA criticised for sticking to imperial units The space agency's decision not to convert its shuttle-replacement programme to metric units could hurt efforts to build a global civilian space industry, critics say ¿ìè¶ÌÊÓÆµ
SpaceInflatable tower could climb to the edge of space A giant pneumatic structure could let people climb 20 km without the need for a rocket – and it could be constructed with current technology ¿ìè¶ÌÊÓÆµ