The World Cup brought a barrage of big moments, goals and a lot of extra time over the past month.
It also brought a few scary collisions, including one in the World Cup Final, where Germany midfielder Christoph Kramer had a huge collision with Argentina's Ezequiel Garay and continued playing for 14 minutes before he collapsed on the field.
Christopher Nowinski is the Executive Director of the Sports Legacy Institute, which studies brain trauma in athletes and advocates for safer sport policies.
He joins us to talk about concussions in soccer and how they can be prevented or minimized from youth soccer leagues to the World Cup.