The World Of Ptavvs

by Larry Niven

Published 7 October 1971

Larry Greenberg's telepathic tendencies had been trained and developed to a critical level. The trouble was that if these psychic interchanges were strong enough, a man could end up not knowing who he really was. But when Larry's mind is taken over by an alien force, he has to fight to retain his sanity - and divert a disaster that threatens all mankind.

And when Larry's mind is taken over by a sinister alien force, he has to fight to retain his sanity - and divert a disaster that threatens all mankind...


A Gift from Earth

by Larry Niven

Published 7 October 1971
[from back cover]

A solitary mountain rises from the searing, toxic blackness of the planet. Forty miles below, the atmosphere is sixty times as thick as Earth's, and hot enough to melt lead.

The organ banks are the centre of this world. To them the subservient colonists contribute living limbs. And from them the overlords obtain the vital parts that keep them all alive...