In the womb, 8000 brain cells are born every second, primarily neurons, but also glial cells (eg. astrocytes and oligodendrocytes etc.). Each brain cell within the human brain makes 10,000 connections. The fovea is the only part of the eye where vision is perfectly crystal clear. The human eye blinks up to 20x per minute and lingers for 0.5 seconds. Added up together, the human eye is shut for 1 hour each day. Eyes are adapted to see in air and because of this, underwater everything looks blurry...
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