There are 3 worms crawling in a straight line. The first worm says, "I can feel there 2 worms crawling behind me." The last worm says, "I can see there are 2 worms crawling in front of me." But the middle worm says, "I don't see any worm in front of me; and I don't feel any worm behind me."
Why did the middle worm said that?
Why did the middle worm said that?
