You can tell the age of a whale by looking at the wax plug in its ear. This plug in the ear has a pattern of layers when cut lengthwise that scientists can count to estimate the age of the whale.

Oslo, Norway is the world's most expensive city. A gallon of gas costs almost $8, and it costs $1.32 to use the public restrooms.

Jane Barbie was the woman who did the voice recordings for the Bell System.

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