With more than 50,000 people from around the world attending the Rio+20 conference in Rio De Janeiro, the global conversation has reached an almost fever pitch. Presidents met with students, students with indigenous groups, indigenous groups with Nobel prize winning economists, economists with reporters, and reporters with just about all of us.
But for one, brief moment, it is fair to say a group of four men managed to rise above the fray and capture everyone's attention.
Amid the pomp and circumstance of yesterday's ceremonial opening, the lights briefly dimmed and astronauts from the International Space Station greeted the delegates in short video produced by our friends at NASA, the Russian Federal Space Agency, and the European Space Agency.
The video was greeted with stunned silence before the delegates, including scores of presidents, prime ministers and government ministers, erupted into thunderous applause.
Well done NASA, thank you a most unexpected moment of zen here at Rio+20.
Join the conversation on Twitter by following #USRIO20 and #RioPlus20.