#Boomerang by macro.girl Today’s #BoomerangOfTheWeek is brought to you by Sofia Englund (macro.girl) with the help of some ferrofluid, a liquid that becomes strongly magnetized in the presence of a magnetic field. She calls it her “weird stress ball” — but to be clear, that’s weird in a good way. Add #BoomerangOfTheWeek to your next #Boomerang. Yours might show up here on instagram.