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Swimming (David Gray/Reuters/Corbis)
Who, what, where and when—all you need to know about this year's Olympic sports. more
Figure 1: Vector Addition of Complex Numbers (Microsoft Corporation. All Rights Reserved.)
The first calculator was invented over 2,000 years ago in ancient Greece. Johnny Ball reveals how to solve complex sums using a pencil, ruler and set square. more
Technology Meets History (F. Damm/zefa/Corbis)
With the spotlight turning on Beijing this summer, how much do you really know about China, the world's most populace country? more
Tea Break
Tea Break
Recharge your brain with a heady brew of Encarta's best...
Did You Know?
Did You Know?Which monarch enjoyed the longest reign in European history?
Find out here.
Mystery Picture
This Day in History
On This DayAugust 7, 1819
Spanish royal forces were defeated by a revolutionary army led by Simón Bolívar at the Battle of Boyacá.
See what else happened on this day in history.
Word of the Week
Word of the Week
What does transubstantiation mean?
2008 US Presidential Election
2008 US Presidential Election
Other features include presidential quizzes, famous debate smackdowns and more. Be an informed world citizen!
Single Quiz
Which Central American country was once known as British Honduras?
Quiz of the Day
Quiz of the DayBritish TV History
Find out how much you know about the history of British television.
Click here.
This Week: Our World

Is the Weather Really Changing?
Adam Hart-Davis thinks so.

Environment Quiz
Do you know your carbon footprint?

Garden Style
Ten Gardens to visit.
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