Build your dreams in glass! Engineer Tim Macfarlane shares a bit about the complexities of determining the stress, strain and structural strength of our favorite sparkly material. He brings architects' visions to life, an accomplishment that is no small feat!

You may recognize his work when treading upon sculptural glass staircases at Apple stores around the world. Or climbing the ruby red staircase at Times Square to usher in the New Year. 

But it's not all about the modern application of glass as a building material....

He's also working on the restoration of a historic building in Virginia, circa 1769. Replacing missing sections with glass makes it "clear" to all the separation of the old from the new. A conservators dream! Or is it? Find out more in this engaging interview.