Remember that ordinary people cannot understand units of measurement. Therefore, you should always explain measurements in relation to familiar objects, such as the length of a football field or the number of something that would fit within the period at the end of this sentence. You can also ask your reader to picture how many times things would circle Earth when laid end to end, describe how many would fit on the head of a pin, talk about weight in terms of school buses, or impress everyone with the number needed to reach from the earth to the moon. Just make sure you’ve applied the proper simplifying calculation; otherwise, you’ll find yourself explaining that neurons can grow to be as long as 0.00011 football fields. (You can rescue such an error by adding an exclamation point to the end of your sentence: “A neuron can grow to be as long as 0.00011 football fields!