Advanced Alien Benefactors Cheat Us Out Of Our Radioactives, Get Comeuppance
35778
Old story where aliens sell humans some machines to heal anything, and then disappear with their loot before we realize we've been scammed
9165
Alien abductee joins a galactic patrol where he is instructed by a bird-like alien
136839
Is there a known isotope that generates anti-matter?
139475
story about an undercover agent investigating a super powerful games-playing human-like alien
67118
Short story about alien invasion with a twist.
70709
Why is cold fusion considered bogus?
152532
Aliens hiding important information about the human race; story ends “‘You don’t’ he said?”
29101
McCarthyism, Martian Colonists, Water Powered Ships, and Mining Asteroids Near Saturn
121028
Aliens target wrong planet, causing life on Earth rather than destroying it
15303
novel identification: alien scientists must save their civilization from future destruction
46427
Spy from Earth studies Galactic Empire nobility and prevents plot to depose Emperor
30124
Story about machines generating energy with parallel universes, endangering ours
128075
Using nuclear devices to terraform Mars: Elon Musk's nuclear proposal?
61205
SciFi from an Alien's perspective
72373
Is there any canon evidence that FN-2187 actually worked in sanitation?
50963
Story Identification: interplanetary war won by teleporting bombs past force fields
147383
Human & Alien captured, observed by higher beings