Offline warm up
Which is the best invisible ink? Write 3 messages using milk, lemon juice, and vinegar. Allow to dry. Heat up the paper with a blow dryer to see message appear.
Online warm up
Play a coding game at https://hourofcode.com/uk/learn
Main challenge - Make a Lemon Volcano!
What you need
A pan or tray
Knife (and an adult to help)
Bicarbonate of soda (baking soda)
There isn’t much explanation from me needed for this one team – watch the video below to find out how to create a lemon volcano. Send me your pics!