Venkatesh Rao@vgrEscaping Earth's gravity well remains one of the riskiest collective actions we frequently attempt. Definitely not a "routine" business.3:30 PM · Jun 28, 20152 Retweets5 Likes
YW@sidspunw·Jun 28, 2015Replying to @vgr@vgr and worth remembering that we (humanity) have succeeded escaping it often enough to make a real difference (-> satellites et al)!1