Here's how you can make the cool slime called Oobleck!
Start by filling a bowl (or something bigger like a paddling pool!) with water
Then, a little at a time, add in cornflour. You can use your hands and get messy!
Once it feels slimey and just right, you can add food colouring!
Wahooo! Now you can play with the slimey mixture! Try hitting it hard and then letting your hand rest on it until it sinks in!