Cup Walkie-Talkie Science!

Hi guys yesterday our class made cup Walkie-Talkies for Science. What we did was got 2 cups and we poked a hole at the bottom of one cup with a pencil. Then we pushed the string through the hole with the pencil. Then we pulled the string through the hole. Next we tied a BIG knot in the string. Then we pulled the bottom of the string the knot did not got through the hole because the not is big and keeping it safe in the cup. Then we did same with the other cup.

Here are some photos. Or if you want to make this experiment, click here.