silk

Spiderman's Train-Stopping Stunt Shown Not So Unrealistic, Given Spider Silk's Strength by Dave Freeman http://www.huffingtonpost.com/2013/02/25/spiderman-train-spider-silk-subway-stop_n_2759781.html?utm_hp_ref=weird-science Spider silk is famously strong -- ounce for ounce, it's at...

As standards of history teaching are supposed to be falling around the world, it might be worth trying to captue the imagination of students of world history by presenting much of it in terms of romantic sounding trade routes...