Stained glass is thicker at the bottom - so is it a liquid? Earth's mantle enables plate tectonics, so is it a liquid?Check out Audible: http://bit.ly/AudibleVeSign up for the mailing list: http://www.veritasium.comPitch drop experiment: http://www.thetenthwatch.comThanks to Meg Rosenburg for scripting and animation, Raquel Nuno for filming and Aaron White for script consultation.