I bet you didn’t know it’s National Metric Week, which is celebrated each year during the week containing the 10th of October (see what they did there? 10/10? Because the metric system is all based on 10? Clever!). And the reason you didn’t know about it is that you are either A) using the metric system every day and have no need for National Metric Week, or B) you are an American and will literally use anything other than the metric system. You’ll use feet, stones, grains, football fields, che…