Suppose the writer's primary purpose had been to present information about a civilization's efforts to overcome a natural obstacle in order to survive. Would this essay accomplish that purpose? throughout North Africa and the Mediterranean. of bringing water to an otherwise dry area, allow- ing the Garamantes to thrive there. ring tunnels. No, because the foggaras ultimately led to the downfall of the Garamantes" civilization. PASSAGE III Neutrinos on Ice At the IceCube Neutrino Observatory in Antarctica, eighty-six cables descend 2,500 meters down into the 31 glacial terrain. Each cable is equipped with sixty digital optical modules (DOMs), which, are programmed, to 32 detect a faint blue flash known as Cherenkov radiation. This radiation: a veritable shock wave of photonic energy—is emitted when subatomic particles called neutrinos collide with electrons in the molecules of ice. Although there are countless neutrinos in the. universe (fifty trillion neutrinos pass through your body 34 every second, actually detecting them is a formidable task. Neutrinos carry no electrical charge, are practically weightless, and travel at nearly the speed of light. Neutrinos are rarely affected by matter or electromagnetic fields. For this purpose, many neutrinos have been traveling through space unimpeded for billions of years.
