Researchers have verified what you probably do naturally on a steep slope – walk zig-zag. According to MSNBC, researchers at University of Southampton UK, found that zigzagging is the fastest way up or down a steep slope. Appropriately the university has its own hillwalking club. Deputy Dog has a list of the steepest streets in the world. Canton Avenue in Pittsburgh topped the list. Does this remind anyone else of the fun marble run game where you race marbles?