"Representatives meeting at the General Conference on Weights and Measures voted to introduce four new prefixes to the International System of Units. The prefixes ronna and quetta represent 10^27 and 10^30, and ronto and quecto signify 10^−27 and 10^−30. Earth weighs around one ronnagram, and an electron’s mass is about one quectogram." https://www.nature.com/articles/d41586-022-03747-9 #weights #measures #ronnagram #quectogram #NatureJournal