2012 Summer Olympics
When: July 27-Aug. 12 (Opening ceremony is July 27, with women's soccer starting competition on July 25).
TV: Every competition will be streamed live online at nbcolympics.com or telecast by NBC and its affiliated cable networks.
Number of countries: 205
Number of events: 302
Official website: http://www.london2012.com
About modern pentathlon
•Fencing: A round-robin series of matches in which each competitor has a one-minute bout with epee swords against every other, with the winner the first to score a hit.
•Swimming: A 200-meter freestyle race with athletes seeded in heats according to their personal best times.
•Riding-Equestrian Show Jumping: Athletes ride randomly assigned horses over a course with 15 jumps over obstacles up to 120 centimeters in height.
•Combined Shooting/Running: With a handicap start, athletes run to a shooting range, where they have to hit five targets 10 meters away in under 1 minute 10 seconds, then run for 1,000 meters. They repeat this two more times.
When to watch: Modern pentathlon is scheduled for the final two days of Olympic competition, the men on Aug. 11 and the women on Aug. 12.
Source: USA Pentathlon