English artist Julian Beever is considered a leading chalk artist in sidewalk art. He’s also (clearly with good reason) called Pavement Picasso.
Human cortical neural stem cells
Cortical neurons are located in the cerebral cortex of the brain, a region responsible for memory, thought, language, and consciousness. Neural stem cells are “immature” cells committed to become neurons and helper cells of the brain. Neurons are the liaison between our brain and the world. When we eat a lemon, neurons connected to our taste buds tell the brain that it’s sour. Messages from the brain can also be sent elsewhere, as when neurons command muscles to contract while lifting a heavy object.
Image by Kimmy Lorrain, BrainCells, Inc.
“I do absolutely nothing [in my free time]. I go home and stay there. I wash and scrub up each day, and that’s it. One month I actually grew a mustache, just so I could say that I’d done something.”