tree_rings

 

Check our facts:

http://www.livescience.com/32443-why-are-tree-rings-lighter-or-darker.html

http://na.nefsc.noaa.gov/sharks/age.html

http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.1996.tb00305.x/abstract

http://www.jstor.org/discover/10.2307/1447446?uid=3739776&uid=2&uid=4&uid=3739256&sid=21103109731323

http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8649.1985.tb04294.x/abstract

http://formontana.net/paleolab.html

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Devin Cremins is a graphic designer working in the Raleigh, NC area with a love of science and illustration. Visit octopusoddments.com to see more of her work or follow octopusoddments on tumblr.

Also special thanks to Julia Ellis, who really knows her sharks: http://link.springer.com/article/10.1007%2Fs10641-006-9116-2.