Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

RIO DE JANEIRO, BRAZIL - AUGUST 09:  Michael Phelps of the United States celebrates winning gold in the Men's 200m Butterfly Final on Day 4 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil.  (Photo by Phil Walter/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 09:  Michael Phelps of the United States celebrates winning gold in the Men's 200m Butterfly Final on Day 4 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil.  (Photo by Phil Walter/Getty Images)

    JUST WATCHED

    Michael Phelps wins 21st gold medal

MUST WATCH

Michael Phelps wins 21st gold medal

Michael Phelps won the 200-meter butterfly and the US team took gold in the 4x200 meter freestyle relay.

Michael Phelps wins 21st gold medal

Michael Phelps won the 200-meter butterfly and the US team took gold in the 4x200 meter freestyle relay.