A student, Tony Murillo, recorded some of the lecture on video as Barrese wrote on a chalkboard and stepped through flood water on the classroom floor.

"(The professor) casually continued on his lecture despite a tornado advisory and serious flooding in the room," said Murillo. "His actions are a testament to the dedication of UCSD's faculty."

"He did end up letting us out early," Murillo said.

Watch the video below.

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Travelers walk around the baggage claim in the South Terminal at Hartsfield-Jackson Atlanta International Airport on Thursday, Nov. 6, 2025. Atlanta is among the airports where the FAA will reduce flights due to the shutdown, and airports are facing a shortage of air traffic controllers. 
(Miguel Martinez/ AJC)

Credit: Miguel Martinez-Jimenez