ponder: to think about or consider (something) carefully

A collection of interesting, thought-provoking, or whimsical science tidbits.

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This visualization shows the age of the Arctic sea ice between 1984 and 2016. Younger sea ice, or first-year ice, is shown in a dark shade of blue while the ice that is four years old or older is shown as white. A bar graph displayed in the lower right corner quantifies the area in square kilometers covered by each age category of perennial sea ice. https://svs.gsfc.nasa.gov/4509