Turn your smartphone into a digital microscope for around $10: 

This DIY conversion stand is more than capable of functioning in an actual laboratory setting. With magnification levels as high as 175x, plant cells and their nuclei are easily observed! In addition to allowing the observation of cells, this setup also produces stunning macro photography.

We’re putting this on our must-build list. Related watching: more macro-view videos or Build Your Own Lego Microscope.

Thanks, @dontcallmedarth.