Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.
This activity will test your knowledge of powers of 10 in scientific contexts. See the hints if you need some help understanding the notation.
Will you be able to judge the length of the physical objects, with sizes ranging from 1 Angstrom to 1 million km, with no wrong attempts?
If you do not have a Flash-enabled device, you can print off a set of cards with all the quantities instead.