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693. What is Red Tide?

More correctly known as an algal bloom, the so-called Red tide is a natural event in which estuarine, marine, or fresh water algae accumulate rapidly in the water column and can convert entire areas of an ocean or beach into a blood red color. This phenomena is caused by high levels of phytoplankton accumulating to form dense, visible clouds near the surface of the water. While some of these can be relatively harmless, others can be harbingers of deadly toxins that cause the deaths of fish, birds and marine mammals. In some cases, even humans have been harmed by red tides though no human exposure are known to have been fatal. While they can be fatal, the constituent phytoplankton in ride tides are not harmful in small numbers.
 
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Who Invented?

[emoji117] Electric Lamp, 1879. Inventor : Thomas Alva Edison (U.S.) (1847-1931). First practical demonstration at Menlo Park, New Jersey.

[emoji117] Electric Motor (DC), 1873. Inventor : Zenobe Gramme (Belgium) (1826-1901). Exhibited in Vienna.

[emoji117] Electric Motor (AC), 1888. Inventor : Nikola Tesla (U.S.) (1856-1943).

[emoji117] Electromagnet, 1824. Inventor : William Sturgeon (England) (b. 1783); improved by Joseph Henry (U.S.) 1831.
 
692. What is thermoregulation and hypothermia?

Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. A thermoconforming organism, by contrast, simply adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation. The internal thermoregulation process is one aspect of homeostasis: a state of dynamic stability in an organism's internal conditions, maintained far from thermal equilibrium with its environment (the study of such processes in zoology has been called physiological ecology). If the body is unable to maintain a normal temperature and it increases significantly above normal, a condition known as hyperthermia occurs. For humans, this occurs when the body is exposed to constant temperatures of approximately 55 °C (131 °F), and with prolonged exposure (longer than a few hours) at this temperature and up to around 75 °C (167 °F) death is almost inevitable. Humans may also experience lethal hyperthermia when the wet bulb temperature is sustained above 35 °C (95 °F) for six hours. The opposite condition, when body temperature decreases below normal levels, is known as hypothermia.
 
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