This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

When you change the units, do the numbers get bigger or smaller?

Work with numbers big and small to estimate and calculate various quantities in biological contexts.

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts?

Examine these estimates. Do they sound about right?

Build a mini eco-system, and collect and interpret data on how well the plants grow under different conditions.

Which dilutions can you make using only 10ml pipettes?

Which units would you choose best to fit these situations?

Do you know which birds are regular visitors where you live?

Work with numbers big and small to estimate and calulate various quantities in biological contexts.

Can you work out the parentage of the ancient hero Gilgamesh?

To investigate the relationship between the distance the ruler drops and the time taken, we need to do some mathematical modelling...

How many generations would link an evolutionist to a very distant ancestor?

How would you go about estimating populations of dolphins?

Practise your skills of proportional reasoning with this interactive haemocytometer.

Simple models which help us to investigate how epidemics grow and die out.

bioNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of the biological sciences, designed to help develop the mathematics required to get the most from your. . . .

Have you ever wondered what it would be like to race against Usain Bolt?

Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?

Analyse these beautiful biological images and attempt to rank them in size order.

In which Olympic event does a human travel fastest? Decide which events to include in your Alternative Record Book.

What is the chance I will have a son who looks like me?

Maths is everywhere in the world! Take a look at these images. What mathematics can you see?

Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.

This problem explores the biology behind Rudolph's glowing red nose.

Create a symmetrical fabric design based on a flower motif - and realise it in Logo.