How much is an astronaut’s life worth?

“It needs to be a finite number, for to set an infinite value on the life of an astronaut is to set both the goals of the space exploration effort and the needs of the rest of humanity at naught.” Robert Zubrin explains how NASA’s approach to risk undermines its mission and costs thousands of lives.
reason.com

Hans Rosling on HIV: new facts and stunning data visuals

“When we look at the pattern, one thing comes out very clearly. People say HIV is very high in Africa. I would say, HIV is very different in Africa.” Using Gapminder World, Hans Rosling empowers you to think more clearly about the the ways in which HIV impacts on Africa and the wider world.