Go travelling <a href=" http://www.sleepbox.co.uk/how-to-make-10-mgml-tetracycline.pdf#too ">online tetracycline pets</a> So when, say, the performance of rubber O rings on the space shuttles was analysed, statistical warning signs were addressed on paper but a pressing danger was allowed to remain in the real world. And at low temperature an O ring failed (predictably) on the Challenger and seven human beings died in what became a burning coffin, far from home. Not enough people in the right places remembered that caring about people more than figures would be essential until it was too late.