Microscopic plastic beads from skin care products showing up in the Great Lakes and elsewhere.
The Wall Street Journal has a nice interactive feature called Waste Lands: America's forgotten nuclear legacy that includes maps and details on the history and current status of Manhattan Project sites.
I continue my effort to downsize; please help me Get Rid of Stuff!.
The stems are square, and some of the opposite leaves are fused together at the stem to form a depression or "cup", hence the name of the plant.
After a rain water sometimes collects in those depressions, and you may see birds like goldfinches drinking from them.