A century-old Caltech tradition, Ditch Day is one of the culminating events of the academic year. The day is defined by the “stacks” that seniors create for their younger classmates, challenging them to solve themed puzzles that often entail funky costumes, games, and unconventional activities across campus. This year, Ditch Day stacks included raft-building, scavenger hunts, ethical dilemmas, and more. | Caltech

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A research team led by professor Soon-Jo Chung has developed a deep-learning method that can not only respond to strong winds but also detect, on the fly, when a multi-rotor aircraft has suffered an onboard failure. The system includes a neural network that is pre-trained on real-life flight data and then learns and adapts in real time based on a limited number of changing parameters, including an estimation of how effective each rotor on the aircraft is functioning at any given time. Learn more