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[ It 's ] a way to sharpen a tube , just like sticking a pencil in a pencil sharpener , " said Alex Zettl , a professor of physics at UC Berkeley and senior scientist at Lawrence Berkeley National Laboratory . It 's a situation that delights theorists like Marvin Cohen and Steven Louie , professors of physics at UC Berkeley and members of the Lab 's Materials Sciences Division , who study the behavior of all sorts of materials-nanostructures prominent among them . " We have analyzed data from most of two impact basins on the lunar surface , Mare Imbrium and the Sea of Serenity , and remarkably the correlation that we first glimpsed on the Apollo missions 25 years ago still holds , " said Robert Lin , a professor of physics at UC Berkeley and one of the principal investigators for the magnetic mapping project .