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If heat, irritants or toxins overstimulate the sensory neurons that detect them, some of these cells, called nociceptors, become desensitized or even die. Other nociceptors, however, survive the onslaught by downregulating components…

In the distant past, the Solar System was rife with impacts and collisions. Millions of rocky objects zoomed chaotically through the system, smashing into each other in collisional cascades. Over time, many of them eventually became part of…