Fuel does not stay fresh forever. Gasoline begins to oxidize in a few months, forming sticky varnish and gum that can clog carburetors, injectors, and fuel filters. Diesel faces its own problems: as ...

The first aceclidine-based eye drop to improve near vision in adults with age-related presbyopia, which affects more than 100 million adults in the US alone, has been approved by the Food and Drug ...