A screen displays portraits of Arthur Ashkin of the United States, Gérard Mourou of France and Donna Strickland of Canada, who won the 2018 Nobel Prize in Physics, at the Royal Swedish Academy of Sciences on Tuesday in Stockholm.

A screen displays portraits of Arthur Ashkin of the United States, Gérard Mourou of France and Donna Strickland of Canada, who won the 2018 Nobel Prize in Physics, at the Royal Swedish Academy of Sciences on Tuesday in Stockholm