Happy Birthday: Michael Johnson  July 4,1967 - Michael Duane Johnson is a retired American sprinter. He won four Olympic gold medals and eight world championship gold medals. Johnson currently holds the world and Olympic records in the 400 m and 4 x 400 meters relay.

Happy Birthday: Michael Johnson July 4,1967 - Michael Duane Johnson is a retired American sprinter. He won four Olympic gold medals and eight world championship gold medals. Johnson currently holds the world and Olympic records in the 400 m and 4 x 400 meters relay.

The 7th World Championships in Athletics, under the auspices of the International Association of Athletics Federations, were held at the Estadio Olímpico, Seville, Spain, between the August 20 and August 29. One of the main highlights of the games was the world record set in the 400 metres by Michael Johnson of the United States in a time of 43.18 seconds.

The 7th World Championships in Athletics, under the auspices of the International Association of Athletics Federations, were held at the Estadio Olímpico, Seville, Spain, between the August 20 and August 29. One of the main highlights of the games was the world record set in the 400 metres by Michael Johnson of the United States in a time of 43.18 seconds.

Irena Szewinska of Poland (277) celebrating after winning the gold medal in the women's 400 metres event in the World Record time of 49.28 seconds during the Summer Olympic Games in Montreal, circa July 1976.

Irena Szewinska of Poland (277) celebrating after winning the gold medal in the women's 400 metres event in the World Record time of 49.28 seconds during the Summer Olympic Games in Montreal, circa July 1976.

Some stats coming your way! Here’s Part I of the World Record progression for the 400 metres individual medley!  #BornToSwim

Some stats coming your way! Here’s Part I of the World Record progression for the 400 metres individual medley! #BornToSwim

Janet Evans of the United States won the 400 metres freestyle in world record time, the 800 metres freestyle in Olympic record time and the 400 metres individual medley at the 1988 Seoul Olympics

Janet Evans of the United States won the 400 metres freestyle in world record time, the 800 metres freestyle in Olympic record time and the 400 metres individual medley at the 1988 Seoul Olympics

Last night in Rio, swimmer Katie Ledecky won gold—and broke her own world record in the 400 meter freestyle. Congratulations, Katie!

Last night in Rio, swimmer Katie Ledecky won gold—and broke her own world record in the 400 meter freestyle. Congratulations, Katie!

Oscar Leonard Carl Pistorius (born 22 November 1986) is a South African sprint runner. Known as the "Blade Runner" and "the fastest man on no legs", Pistorius, who has a double amputation, is the world record holder in the 100, 200 and 400 metres (sport class T44) events and runs with the aid of Cheetah Flex-Foot carbon fibre transtibial artificial limbs by Ossur.

Oscar Leonard Carl Pistorius (born 22 November 1986) is a South African sprint runner. Known as the "Blade Runner" and "the fastest man on no legs", Pistorius, who has a double amputation, is the world record holder in the 100, 200 and 400 metres (sport class T44) events and runs with the aid of Cheetah Flex-Foot carbon fibre transtibial artificial limbs by Ossur.

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