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Why do we smell when we sweat?

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Why do we smell when we sweat? Sweating can be quite annoying especially since it tends to leave a big wet patch either on your back or under your arms. It makes it especially worse when your sweat tends to smell really foul. Although the bad news is that there is no way to prevent it, the good news is that you can at least tackle it. Why do we sweat? Sweating or perspiration is our body's natural way of cooling us down. We may feel the heat more when we sweat but the truth is that the body is cooling itself by releasing all the built in heat. Our body needs to maintain a normal temperature of 98.6 Fahrenheit failing which we are likely to suffer a heart stroke. Sweat is released through small holes known as pores in our skin. When sweat comes in contact with the atmosphere, it evaporates leaving a cool feeling behind. Sweat is almost made of water with small amounts of chemicals like ammonia, urea, sugar and body salts like sodium . Our body has approxima...
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Why coffee keeps you awake?

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Why coffee keeps you awake? It is well-known that the effect of coffee on mood is related to its content in caffeine (you can see its pic on the right) But why caffeine has such a strong effect on us? Caffeine operates using the same mechanisms of amphetamines, cocaine, and heroin to stimulate the brain, though with milder effects. It manipulates the same channels as the other drugs, and that is one of the things that gives caffeine its addictive qualities. There is a chemical in our brain called adenosine , that binds to certain receptors and slows down nerve cell activity when we are sleeping. To a nerve cell, caffeine looks like adenosine and it binds to the adenosine receptors. However, as it's not really adenosine, it doesn't slow down the cell's activity like adenosine would. So the cell cannot "see" adenosine anymore because caffeine has taken up all the receptors adenosine binds to. Then, instead of slowing down because of the adenos...
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