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Which number should replace the question mark?

Which number should replace the question mark? Author: Sumbul Azeem

Correct answers: 335

The first user who solved this task is Eric Newton.

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I think Cheney is starting to lose...

"I think Cheney is starting to lose it. After he shot the guy he screamed, 'Anyone else want to call domestic wire tapping illegal?'" -- Jay Leno

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Kariba High Dam

In 1956, the British colonial government in Rhodesia began the construction of the Kariba High Dam across the Zambesi river between North and South Rhodesia (now Zambia and Zimbabwe). Completed in Jun 1959, it was the largest dam of its time and provides electricity to the region. A year later, Britain's Queen Elizabeth officially started the Kariba generators and one of Africa's most ambitious projects came to life. The dam rises 128-m (420-ft) from the river bed. Behind it Lake Kariba stretches back for 290-km (180-mi), covers 6,000 sq km (3,750 sq mi) and is 42-km (26 mi) across at its widest. During construction "Operation Noah" ensured the rescue of over 5,000 animals comprising 35 different mammal species and thousands of reptiles.

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