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However, most of them have limited actuation speeds, require complex control systems, and lack sensing capabilities. To address these challenges, herein, a class of metacaps is geometrically designed by introducing an array of ribs to a spherical cap with programmable bistabilities and snapping behaviors, enabling several unprecedented soft robotic functionalities. Specifically, a centimeter\u2010sized, sensor\u2010less metacap gripper is demonstrated that can grasp objects in 3.75\u2009ms upon physical contact or pneumatic actuation with tunable behaviors that have little dependence on the rate of input. The grippers can be readily integrated into a robotic platform for practical applications. The metacap can further enable propelling of a swimming robot, exhibiting amplified swimming speed as well as untethered, electronics\u2010free swimming with tunable speeds using an oscillating valve. The metacap designs provide new strategies to enable the next\u2010generation soft robots to achieve high transient output energy and autonomous and electronics\u2010free maneuvering.<\/jats:p><\/jats:sec>","DOI":"10.1002\/aisy.202300039","type":"journal-article","created":{"date-parts":[[2023,2,10]],"date-time":"2023-02-10T01:18:33Z","timestamp":1675991913000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["Ultrafast, Programmable, and Electronics\u2010Free Soft Robots Enabled by Snapping Metacaps"],"prefix":"10.1002","volume":"5","author":[{"given":"Lishuai","family":"Jin","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering University of Pennsylvania  3231 Walnut Street Philadelphia PA 19104 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yueying","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering University of Pennsylvania  3231 Walnut Street Philadelphia PA 19104 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bryan O. 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