Pangborn's paradox

"Pangborn's Paradox" by David Mason is a science fiction story that dives into the head-spinning world of time travel through a mix of clever talk and mind-bending experiments. The story introduces us to academic characters who are really into debating the tricky ideas of time paradoxes. The main action centers on a wild experiment where a man tries to bump off his own grandfather to test the rules of existence and cause-and-effect. When the traveler meets his match in the past, things get turned upside down, making everyone rethink what they thought they knew about time and who we are.