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SEM image of the week: Tax day approaches

Posted on Monday, April 16, 2012 by for SEM.

Reminder: Tuesday, April 17, 2012 is the deadline for filing federal and state tax returns in the US for income earned in 2011. This week’s scanning electron microscope images have a connection to taxes (and tests and other equally fun things).

I am usually made from zinc-plated steel. I come in bunches held together with glue.
I am used to fasten things together.
?
What am I?

Image and caption credit: Mahmud Ashik

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