When Kelly Anderson shed her arm cast two months after a wrist operation, her joints were so stiff she couldn’t turn a doorknob. She didn’t fully recover for another four months. Daniel Amante suffered similar post-cast complications after he injured his knee; Amanda Harton watched her soccer teammates struggle following various injuries; and Clara Tran saw even greater suffering among the frail patients in the nursing home where she volunteered.
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.