For Science Week, we decided to make slime. Our first batch didn't turn out so well as we were missing an important ingredient. We tried again with different eye drops and had much more success. The children loved watching the process and feeling the slime.
If you're feeling adventurous and want to try out slime at home, follow this link: https://www.bbcgoodfood.com/howto/guide/how-make-slime
(TOP TIP: Make sure your contact lens solution contains sodium borate or boric acid. We used an Optrex eye bath)