It helps plants grow, it dries clothes and it keeps us warm - but what is it? It's the sun, of course - and it powers all of life on Earth.

We can see the power of the sun by growing different kinds of plants, such as beans, mustard and cress or flowers.

Let's design and make two important tools that can help plants to grow properly: a mini greenhouse, and a timer to remind us when our plants need watering.