The problem with dark energy is that you can’t see it -- so how do you even know it’s there? Astrophysicist Adam Riess tells us that you can look at the stuff dark energy pushes with its gravity--the same way you can detect wind by how it moves smoke.
Listen now on our website: http://tiny.cc/u88ebw or take hour two with you on iTunes: http://tiny.cc/v3s8i.
