UCLA researchers are using a radioactive tracer, which binds to abnormal proteins in the brain, to see if it is possible to diagnose chronic traumatic encephalopathy in living patients. Warmer colors in these PET scans indicate higher concentrations of the tracer.
France's Olivier Giroud, center, goes down after a header during the group C match between Denmark and France at the 2018 soccer World Cup at Luzhniki Stadium in Moscow on Tuesday. The teams played to a scoreless tie — the tournament's first.
Golden State Warriors guard Quinn Cook in the second half during an NBA basketball game against the Phoenix Suns on April 8, 2018, in Phoenix. Cook started his basketball career in Ohio, where Game 3 of the NBA Finals happens on Wednesday.