How Many Calories are on a Smudgy Screen?

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How Stuff Works on Figerprints: http://science.howstuffworks.com/fingerprinting2.htm

Fingerprints on Wikipedia: http://en.wikipedia.org/wiki/Fingerprint

Twins and DNA: http://www.nytimes.com/2008/03/11/health/11real.html

da Vinci fingerprint on painting: http://www.leonardodavinci.net/portrait-of-ginevra-de-benci.jsp

What makes up a latent fingerprint: http://www.chm.bris.ac.uk/webprojects2002/thomson/fingerprints2.htm

What makes up sebum: http://en.wikipedia.org/wiki/Sebaceous_gland#Composition

Losing your fingerprints: http://www.scientificamerican.com/article.cfm?id=lose-your-fingerprints

Adermatoglyphia: http://www.handresearch.com/news/adermatoglyphia-genetic-no-fingerprints-disease.htm

Koala fingerprints vs human fingerprints: http://io9.com/5798400/koalas-have-exactly-the-same-fingerprints-as-humans

surface area of an iPhone5: http://appadvice.com/appnn/2012/09/op-ed-iphone-5-or-iphone-why

Great smudge photography: http://chrisglass.com/album/2010/04/03/touched/

Breast milk as a food source: http://io9.com/5880037/the-next-time-youre-stranded-on-an-island-with-only-one-food-source-make-sure-its-breast-milk

Problems with fingerprinting [PDF}: http://www.ajs.org/ajs/publications/Judicature_PDFs/902/Cherry_902.pdf

Book on probabilities (including fingerprint-matching): http://bit.ly/TgfjlK

More on individuality of fingerprints [PDF]: http://bit.ly/V0LRhO

Fingerprint rings: http://gizmodo.com/fingerprint-ring