Shield Author:Poul Anderson When the first manned Mars mission returns from an alien-populated Mars, they radio ahead with one scientist's adaptation of alien science: a kinetic force shield. Big mistake -- now all the governments of the world want his prototype for themselves, and will kill anyone in their way. — Fleeing into Earth's underground to meet up with the... more » mob, the lone scientist tries to survive long enough to keep his invention from becoming the ultimate superpower device.« less