Jack Cox
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The world's largest beaver dam was recently discovered in northern Alberta, Canada. It is estimated to be about 850 metres long.
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Matt Murray
On Jan. 25, 2013, the largest known prime number, 257,885,161-1, was discovered on Great Internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer. The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits.