Do you know which birds are regular visitors where you live?
Simple models which help us to investigate how epidemics grow and die out.
With thanks to Class 6K
Mayfield Primary School, Cambridgeshire
for letting me observe their science lesson.
Watch the video below to see one way of making a simple helicopter.
Guidance could be offered on the sorts of changes to make, for example, keeping the helicopter in the same proportions, but gradually increasing its overall size, or keeping the width of the wings and the body constant, and gradually increasing the length of the wings and body.