Page 3 - Grade Scale News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> heather: engineers trying to keep temperatures cool in several reacts to avoid a nuclear meltdown at several facilities. exactly how to nuclear reactors work. peter doocy investigates. >> there are 442 nuclear reactors operating in the world. 55 are in japan and six of those have had problems since the earthquake and tsunami this past week. this is what the boiling water reactor looks like right now. to make nuclear science as simple as possible the explosion happened in the secondary containment area but the primary containment area remains intact. and the international atomic energy commi...

It's been worth every penny we spent on it. >> no kidding. look at some of these most spectacular images that the hubble telescope has been able to capture. i mean, who wouldn't be interested in space for goodness sake as a child or an adult when you see these beautiful image? >> it's fascinating. ed, one question about those images, our understanding is that the hubble telescope takes all of its pictures in grade scale, basically black and white and the colors are added later. so the question is who decides what colors to add and how do they know? >> well, it's actually a pretty standard proc...