Because Owls are generally active at night, they have a highly developed auditory hearing system. The ears are located at the sides of the head, behind the eyes, and are covered by the feathers of the facial disc. The "Ear Tufts" visible on some species are not ears at all, but simply display feathers. The shape of the ear opening known as the aperture depends on the species of Owl - in some species, the opening has a valve, called an operculum covering it. The opening varies from a small, round aperture to an oblong slit with a large operculum. All owls of the family Tytonidae have rounded openings with large opercula, while in Strigidae, the shape of the outer ear is more varied.
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Euler's Disk , invented between and by Joseph Bendik,  is a trademark for a scientific educational toy. Joseph Bendik first noted the interesting motion of the spinning disk while working at Hughes Aircraft Carlsbad Research Center after spinning a heavy polishing chuck on his desk at lunch one day. The spinning effect was so dramatic that he immediately called his friend and co-worker Richard Henry Wyles to take a look. He also called his friend Larry Shaw Astrojax inventor on the phone and had him listen to the sound of the spinning disk.
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What launch speed must the proton have to just barely reach the positive disk? Q: An T worker is setting up a new computer system for an administrative assistant. She places a A: Find the final time at which the printer should be placed.