The United States hopes to stop Russia from exporting certain lasers. Boris Yatsenko of the D.V. Efremov Institute of St. Petersburg says they'll be used only for "scientific, industrial and medical purposes," but the United States isn't convinced. Who do they fear will use the lasers to do what? 

Send your answer by 6 p.m. ET Thursday to newsquiz@slate.com.

Monday's Question (No. 479)—"Talking Turkey":

When they got their first one 125 years ago, some Turks feared it on religious grounds. No more. Fill in the blank as Osman Canturk enjoys the grand opening of a new one in Istanbul on Saturday: "If you are a person with faith, you are not afraid. So I'll be happy to go on this _____________."

"Bathroom scale."—Dan Dickinson

"Quiz show."—Ellis Weiner

"French prostitute."—Mark Wade

"Russian-built nuclear submarine."—Bonnie Resnick and Mark Romoser

"Pork-fueled locomotive."—Tim Carvell

Click for more answers.