Like most vegetables, cucumbers are tender and tastiest when harvested young before their seeds are fully developed. Slicing cucumber varieties are generally ready for harvest when about six to eight inches long; pickling types at three to five inches.
Headlights on âupperâ or âhighâ beam let you see about 350-400 feet ahead. 400 feet is your approximately stopping distance when driving at 50-55 mph. That is about the length of a city block. In other words, high beams let you see twice as far as low beams.
People with good eyesight, on a clear night, can see the Pinwheel galaxy, and that's about 27 million light years away. That's the most distant thing I know of that can be seen with the naked human eye. Vision is constrained by how clear the air is, and how much light is reflected or emitted by the object being viewed.