A slippery test of intelligence, teamwork and athleticism decides which team wins the Nerd War. And in a bittersweet Nerd-Off, close friends must face a 400-pound weapon of mass distraction to prove they deserve to stay another week in Nerdvana.

The laws of physics - as well as some broken glass - decide which nerd is safe from exile in this week's Nerd War, and it comes as a surprise to all. To determine the final four contestants, one last Nerd-Off tests the nerds and the structural integrity of their engineering wonders.