Microgravity sex is a topic of immense interest to teenage fanboys and scientists alike .
微重力下的性爱不仅让青少年浮想联翩，科学家对此也饶有兴趣。
A 1998 columbia flight showed that rats born in microgravity have no sense of up and down .
1998年哥伦比亚号的一次飞行证明在微重力环境下出生的老鼠没有感知“上下”方位的能力。
This is compounded by the fact that long exposures to microgravity have been shown to exacerbate presbyopia in astronauts .
雪上加霜的是，长时间曝光于微重力之下已被证实会加剧宇航员的老花眼。
That nikon 800mm f / 5.6 lens weighs 12 pounds here on earth , but in microgravity , it 's considerably easier to wield .
尼康800mmf/5.6镜头在地球上重达12镑，但是在微重力条件下，握持它却要容易得多。
Space station crews returning to earth show that we also suffer severe muscle loss in microgravity - possibly enough to make it impossible for women to give birth naturally in space .
