Ihave a question about a rock my friend found yesterday outside. we noticed that when we would shake the rock you could hear and feel something moving inside. my sister threw the rock and it broke and it looks really weird on the inside and theres a little oval shaped ball in it but the ball isnt hard, it kind of has the texture of mud and clay put together and on the inside of the rock there are rings all around it in an oval shape. just wondering if anyone can , (:

Weird . when i was younger  I find what  i thought was a rock but it wasn't it was a snail . maybe you find a snail and it just looks weirder because it find it way in it. or maybe it was a slug that find it's way into the rock. but i'm not certain

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.