Science Expierement

When I was about 7 I made a worm catcher. It consisted of just one paper towel and four small stones. It was a very simple project as all you had to do was put the paper towel on a dirt surface then place the four small stones in each corner. I then waited 2 days for the worms to show up, then I went outside and picked up the paper underneath was a small group of worms. The reason the worms came up was because of the paper towel covered the dirt and made the dirt nice and cold for the worms, the worms then come up to the top of the soil and rest.