Breaking in a new vehicle is really about the engine. The break-in — or mechanical run-in — period is designed to begin to wear the engine evenly and smoothly with low, consistent pressure, normal operating temperature and smoothly flowing oil. The goal is to get the engine's piston rings, which expand, contract and flex, to seat properly on the cylinder walls. If there are imperfections in the pistons or the cylinder walls from the manufacturing process, working the engine too hard and too soon can wear down those imperfections too quickly. That leads to "hot spots" within the engine's cylinders, which can cause problems in the years to come. … [Read more...] about Do You Have to ‘Break In’ a New Car?
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Coordinates in the Sky "The purpose is to be able to uniquely specify a location in the sky. It's just like latitude and longitude on Earth," Rick Fienberg, press officer for the American Astronomical Society, explains in an email. "If you tell someone to meet you in Littleton, Colorado, at 39°36'47.9484''N, 105°0'59.9292''W they will not only know which town you're in but also which street corner you're waiting at.... It wouldn't be very useful to someone else to know only which town you're in — you need to be more precise if you have any hope of being found by the other person." … [Read more...] about How Do We Find Things in the Blackness of Space?