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A cool math game that is free to play. Estimate the weight in standard units of each object dropped on the scale.

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Notes and images of blue whales, updated from the Canadian Museum of Nature's Natural History Notebooks series.

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a rough calculation of the value,

number, quantity, or extent of something.

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The largest creature ever known to have existed on Earth is the present-day blue whale.

Today's blue whale is even larger than its prehistoric ancestors, reaching a total length of

30 m (100 ft.) and a weight of 136 t (150 tn.).

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Blue Whales can be found in the Arctic Ocean,

Atlantic Ocean, Indian Ocean, Pacific Ocean, and

Southern Ocean.

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Blue Whale - BBC Wildlife

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The blue whale is not only the largest animal alive currently, but is likely the largest animal ever to have lived