Life's Little Mysteries answers fascinating questions about the world around you and the stuff in it, from things in the news and on your mind to crazy questions you didn't even know you had.
Many of us have experienced the burning, aching, jelly-leg feeling that creeps in hours, or even days, after exercise. But where does it come from and why does it always show up a couple days after intense or new workouts?
Nut-obsessed squirrels might be smarter than you think.
Here are the most intriguing "little" mysteries we've gathered about fall.