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).
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| I am usually made from zinc-plated steel. I come in bunches held together with glue. | ||
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| I am used to fasten things together. | ||
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| What am I? | ||
Image and caption credit: Mahmud Ashik