the.com/rod
a humble stick promoted to lightning's bodyguard, fishing's accomplice, and the body's tiny night-watchman.
eye dutyRod cells let you see in near darkness
countYour retina holds about 120 million rods
old unitA rod equals 16.5 feet, surveyor's leftover
lightningFranklin's pointed rod redirects strikes safely to ground
no colorRods are colorblind, leaving hues to cones