"The Arch in Allure of Worlds carries a significant symbolic impact just by standing there. But the desert archway has a mission greater than being visually affecting. Its shape and monumental size suggest movement through time and space, and invite inquiry into the complex, fascinating stories of human expansion. It typifies the spirit of those seeking new frontiers within the confines of earth."
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.