The pulse is what you're seeing as the flame waxes and wanes in the jar, and it gives the flame that weird crackling noise you hear. Of course, the jar can only handle the heat and pressure for so ...

This week on Smosh Lab - creating a pulse jet in a jar! Warning - Do not try this at home! We are trained professionals! SMOSH LAB pairs SMOSH super-talent SHAYNE TOPP with an actual scientist and ...