There are some facts around how much a kilogram really is right now. You could say the measured differences are insignificant, but yet, is it not a little irritating to know these matters are also subject to change? In this video Tom Scott meets Stuart Davidson, head of mass metrology, and Ian Robinson, electrical metrologist of the National Physical Laboratory in the UK and they talk about this particular curiosity in physical sciences. If this type of subject is of interest to you, you will surely like this video feature. Enjoy!

Photo credit: Philippe Put