By the time they were 10 and 12, the Yeung sisters had been on national TV, gotten a personal tour of NASA’s Jet Propulsion Lab and had a face-to-face meeting with President Barack Obama. This early notoriety followed their forays into space exploration — or at least, space-adjacent. Rebecca, now 14, and Kimberly, now 12, had visited the stratosphere three times with their Loki Lego Launcher , a homemade weather-balloon-borne science probe.