Download or read book Close to Critical written by Hal Clement and published by Hachette UK. This book was released on 2011-09-29 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shrouded in eternal gloom by its own thick atmosphere, Tenebra was a hostile planet: a place of crushing gravity, 370-degree temperatures, a constantly shifting crust and giant drifting raindrops. Uncompromising - yet there was life, intelligent life on Tenebra. For more than twenty years, Earth scientists had studied the natives from an orbiting laboratory... and had even found a way to train and educate a few of them.