Only 10% of the energy used by an incandescent bulb produces light; the rest is given off as heat.
Source: Energy Information Administration
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Knut the polar bear
To make the story short, Knut is polar bear cub abandoned by his mother, so he had to spend the first 44 days of his life in an incubator. He is now being taken care by a zoo keeper (in Berlin Zoo, that is), who practically lives with him 24/7, feeds him milk, plays with him and teaches him basic self-care any baby bear (or maybe any baby animal) should learn, and practically treats him like his own infant kid.
But this cutie has become a national sensation, not because of his "dramatic" life (if I'm not mistaken, animal newborns neglected by their parents are pretty common), but because his very existence is disputed. Some animal rights campaigners opined that the Berlin Zoo had made a mistake when they saved his life at the first place. Their main argument has been that intervention in an animal, particularly wild animal's life cycle will only harm the animal. One of them has angered many people when he said that the zoo should've killed Knut while he was just born. The zoo management, and those on their side, responded by emphasizing that it's one way to keep the polar bears' population from further extinction (note: Knut is the first cub born in the Berlin Zoo in the past 20 years).
But this cutie has become a national sensation, not because of his "dramatic" life (if I'm not mistaken, animal newborns neglected by their parents are pretty common), but because his very existence is disputed. Some animal rights campaigners opined that the Berlin Zoo had made a mistake when they saved his life at the first place. Their main argument has been that intervention in an animal, particularly wild animal's life cycle will only harm the animal. One of them has angered many people when he said that the zoo should've killed Knut while he was just born. The zoo management, and those on their side, responded by emphasizing that it's one way to keep the polar bears' population from further extinction (note: Knut is the first cub born in the Berlin Zoo in the past 20 years).
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