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