"gadgets: tuning peg" by Jonathan Cohen, used under CC BY / Cropped from original; "deer tongue grass, md, upper marlboro_2014-06-04-11.46.05 ZS PMax" by USGS Bee Inventory and Monitoring Lab, used under CC BY; "4369530848_d9b64a7556_z" by JesseClaggett, used under CC BY / Desaturated from original; "Lightning hits tree" By Johnny Autery [Public domain], via Wikimedia Commons; "Graduated Cylinders" by skycaptaintwo, used under CC BY / Cropped from original