In prehistoric times, not much needed to be measured. You ate what you found and lived where you could. The […] ...

This metric system had as its fundamental unit of length the meter, defined to be a small fraction of the length of a meridian of the earth. Other units of length were decimal multiples or fractions ...

The mass of a bag of sugar, commonly 1 kg (kilogram). Work out what metric unit could be used to estimate the height of a leisure centre. Using the fact that the height of a standard door is 2 ...