50 authors, 50 science fiction stories shorter than novels 6 years ago
Harry Turtledove has some very interesting short stories, such as "Road Not Taken" that concerns alien invaders in our near future.
But overall he's a master of the alt-history genre and worth the attention of reading his books. Guns of the South: General Lee on the cover holding an AK-47. He's a historian and did original primary research for it, but, 'nuff said. Worldwar In the Balance: Aliens attack in 1941, during fierce WWII fighting. Well fleshed out.