In this Jan. 25, 1955, file photo, Charles Townes, Columbia University professor and Nobel laureate, explains his invention, the maser, during a news conference in New York City. He later joined the UC Berkeley faculty.
In this Jan. 25, 1955, file photo, Charles Townes, Columbia University professor and Nobel laureate, explains his invention, the maser, during a news conference in New York City. He later joined the UC Berkeley faculty. Associated Press file
In this Jan. 25, 1955, file photo, Charles Townes, Columbia University professor and Nobel laureate, explains his invention, the maser, during a news conference in New York City. He later joined the UC Berkeley faculty. Associated Press file

Charles Townes, Nobel Laureate and laser inventor, dies at 99

January 28, 2015 07:02 PM