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From European settlement in 1888, child convicts were occasionally sent to Australia where they were made to work. Child labour was not as excessive in Australia as in Britain. With a low population, agricultural productivity was higher and families did not face starvation as in established industrialised countries. Australia also did not have significant industry until the later part of the 20th century when child labour laws, and compulsory schooling had developed under the influence of Britain. From the 1870s Child labour was restricted by compulsorry schooling.

What restricted the 1870s Child labour in Australia?
Answer: compulsorry schooling
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Lamps designed for different voltages have different luminous efficacy. For example, a 100-watt, 120-volt lamp will produce about 17.1 lumens per watt. A lamp with the same rated lifetime but designed for 230 V would produce only around 12.8 lumens per watt, and a similar lamp designed for 30 volts (train lighting) would produce as much as 19.8 lumens per watt. Lower voltage lamps have a thicker filament, for the same power rating. They can run hotter for the same lifetime before the filament evaporates.

How many lumens per watt does a typical train light produce?
Answer: as much as 19.8 lumens per watt
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Based on discoveries made through neural mapping of the limbic system, the neurobiological explanation of human emotion is that emotion is a pleasant or unpleasant mental state organized in the limbic system of the mammalian brain. If distinguished from reactive responses of reptiles, emotions would then be mammalian elaborations of general vertebrate arousal patterns, in which neurochemicals (for example, dopamine, noradrenaline, and serotonin) step-up or step-down the brain's activity level, as visible in body movements, gestures and postures. Emotions can likely be mediated by pheromones (see fear).

What chemicals may mediate emotions?
Answer:
pheromones