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Difficulty: Fun Mariana the astronaut weighs 51 kilograms on Earth and 8.5 kilograms on the Moon. Mariana is training Javier to go to the Moon. If he weighs 78 kilograms on Earth, how much will he weigh on the Moon?

Difficulty: Tricky You’ve just joined a new Scouts group! You meet 4 other new people, and everyone is going around giving handshakes. If everyone shakes hands with everyone else exactly once, how many handshakes will there be in total? (Remember you can’t shake hands with yourself.)

Get a rise out of your dough with a simple acid-base reaction!

Bakers have used yeast to make bread for millennia! We now know why it works and how a little sweetness goes a long way. Safety: When dealing with food, use clean hands and clean equipment. Be careful when using the oven by wearing oven mitts and ask an adult to help you out.

Difficulty: Tricky Consider the following sequence of numbers. What number comes next? 1, 1, 2, 3, 5, 8, 13…

There’s nothing like a pretty flower to brighten your day. Will this quiz brighten yours when you get full marks? 

What is the area of the orange star in the centre? The blue circles each have an area of 3 square centimetres, and the big square has sides that are 4 centimetres long.

Scientists thought they knew how gas giants like Jupiter were made. Now a newly spotted planet in a faraway solar system is challenging the recipe.

You would never add a heap of salt to your ice cream, but this tasty treat can be made by taking advantage of a chemical property of salt and a bit of elbow grease. Here’s how! Safety: The ice in this activity can get very cold, well below freezing. Take care not to touch it…

Jing is taking her submarine to the bottom of an ocean trench. The first day she goes half the distance to the bottom of the trench.