Traditional lap pools are about 10 feet wide, though widths between 8 and 10 feet are common. (In competition pools, swim lanes are 2.5 meters wide, or about 8.2 feet.) You don't want to go too narrow with a lap pool.
The number of neurons in the brain varies dramatically from species to species. One estimate (published in 1988) puts the human brain at about 100 billion (10 11) neurons and 100 trillion (10 14) synapses.
The human brain has more than 100 billion neurons (nerve cells) which make up a complex communication system. This quiz tests your knowledge about these highly specialized cells in the nervous system, which allow us to feel pain, emotions, touch, and give us the ability to have memory.he human brain has more than 100 billion neurons (nerve cells) which make up a complex communication system. This quiz tests your knowledge about these highly specialized cells in the nervous system, which allow us to feel pain, emotions, touch, and give us the ability to have memory.