{:crux.db/id :commodity/Pu :common-name "Plutonium" :type :element/metal :density 19.816 :radioactive true} {:crux.db/id :commodity/N :common-name "Nitrogen" :type :element/gas :density 1.2506 :radioactive false} {:crux.db/id :commodity/CH4 :common-name "Methane" :type :molecule/gas :density 0.717 :radioactive false}