Children smudging their hands onto every available surface is normally gross and annoying — unless, that is, the available surface in question is a sterile plate, which you then incubate in a petri dish.
Wanna create your own beautiful, living, breathing solar system at home? It's easy—you just need petri plates (or any kind of flat, wide and shallow containers), some fatty milk, a little dish soap, food coloring and liquid plungers and droppers. And your own imagination.
Today, Google honors German bacteriologist Julius Richard Petri (born May 31st, 1852), the scientist credited with the invention of the Petri dish – a ubiquitous research tool particularly suited to raising cell cultures and revealing how gross-and/or-fascinating the world is, generally.
A fertilized, incubated chicken egg takes about 21 days to hatch; and while most of us have seen what chicks look like at either end of the developmental spectrum (either sunny-side-up in a frying pan or newly hatched in a nature documentary), the fact that egg shells aren't see-through means that not many people have…
Salmonella. Escherichia coli. These once feared bacterias have joined the forces of good to sanitize your hands as fancy soaps.