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Diving equipment, or underwater diving equipment, is equipment used by underwater divers to make diving activities possible, easier, safer and/or more comfortable. This may be equipment primarily intended for this purpose, or equipment intended for other purposes which is found to be suitable for diving use.
The electric sirens were controlled via phone lines and were operated from a central location, such as a city hall, fire station, post office, or local military base or outpost. Initially, there were only two siren signals, similar to the signals used in Britain at the time: "Red Alert/Air Raid Warning" signal, indicating an imminent threat ...
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A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
A ratchet featuring a gear (1) and pawl (2) mounted on a base (3) Animation of ratchet gear rack (green) and pawl (pink). Red arrows indicate which way force is applied to the gear rack. The rack and pawl are both restricted to only linear movement (not shown).
The shark exhibited partial pigmentation reduction, resulting in a pale appearance with white-greyish patches. Classified as leucistic, this case represents the first documented instance of leucism in the species and the first color disorder reported in the family Oxynotidae. Despite its atypical appearance, the shark's physical health appeared ...