On Interstate 280, just south of the Sand Hill Road exit, near Stanford, there is this overpass that crosses over a long, skinny building. Bay Curious listener Eric Nelson has wondered what that building is for years. Turns out, scientists are unraveling the mysteries of the universe inside SLAC. We take you on a tour.

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This story was reported by Rachael Myrow. Bay Curious is made by Olivia Allen-Price, Katrina Schwartz, Christopher Beale and Brendan Willard. Additional support from Cesar Saldana, Jen Chien, Katie Sprenger, Maha Sanad, Jasmine Garnett, Carly Severn, Joshua Ling, Holly Kernan and the whole KQED family.

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