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A temperature change requires as gain or loss of heat energy.
Was a dietition involved in vegan diet
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The answer to the riddle is "a promise." When you make a promise, it can lead to having two outcomes: fulfilling the promise (which can create a sense of trust or fulfillment) or breaking it (leading to disappointment or loss of trust), effectively resulting in none of the intended outcomes. Thus, a promise can result in two results or none at all.
The promise of killing the piglet signifies a commitment or intention to follow through with an action, often implying a stark realization of the brutal or violent nature of the situation. In the context of literature or film, this promise can symbolize the characters' descent into savagery or the loss of innocence.
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The most advertised weight loss plans seem to be Weight Watchers and Atkins, as they promise to "make dieting easy". However, the best diet plan for oneself requires research and discussion with a familiar doctor. Personalized plans tend to exceed the promises of commercial plans.
There are a number of programs that promise quick weight loss. I'd be very suspective of any program that makes such claims. http://quickweightloss.net/program.php
Friction requires energy to overcome it. This causes loss of energy in the system. Loss of energy in a system, by definition, is a reduction of efficiency.
There are many weight loss scams online but there are some genuinely helpful schemes such as WeightWatchers. Beware plans that seem to promise results that are too good to be true.