Look carefully at this floor. There’s a big hole in it isn’t there? Nope, it’s actually perfectly flat and was designed to stop you running down the hallway of a showroom for Casa Ceramica, a tile company from Manchester, UK.
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BE_Myelinated nerves. A section through myelinated nerve fibers and Schwann cells. Myelin (green) is an insulating fatty layer that surrounds the nerve fibre (axon, black), increasing the speed at which nerve impulses travel.