Day 4 has come to an overwhelmingly successful close! We started off the morning with some extraordinary lectures, on topics such as Darwin's theories, special relativity, plane linkages, and Apery's constant. The day continued wonderfully; sun shining, birds chirping, semilabs buzzing! After programming robots, tying knots, and learning about the chemistry of fire (among other classes), we took turns swimming, boxing, playing chess and ping-pong, and many more fun activities!