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Most people may think of pain killers kills the pain or cures the pain.But actually a painkiller do not cure the pain,there are many signals sent from a part of body to the brain for example-If someone beats you a sensation of pain can be observed or if you get an electric shock you get an sensation this is because of the signals sent from a part of body to brain.If the messages in the form of signal do not reach the brain you dont get any pain.The brain warns you that something dangerous is in contact with your body so you feel the sensation.Even when you shiver it is not done by yourself it is the message sent by brain to keep the brain warm,because if the brain gets cold then the person dies.And it is difficult to shiver yourself so it cannot be done yourself without the message of brain.
Now what actually happens is the painkiller travels through nerves or blood vessels and cut the signals or messages from reaching the brain so after consuming a pain killer your the pain is gone.So see the picture , a person has hand pain and the scissor mentioned here is painkiller.
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We know that water is colourless. But once it starts falling from a height, it appears white. The reason is because water has oxygen dissolved in it, and when it falls from a height, the dissolved oxygen evaporates in the form of a gas. Consequently, millions of small water bubbles are formed. These little droplets of water act like millions of tiny mirrors that reflect light at different angles, in different directions.This is known as scattering of light. When light is scattered, it becomes white in colour, because of a phenomenon known as diffuse reflection. Diffuse reflection can also be seen when light strikes an irregular surface of a clear substance like glass, such as frosted window, or the surface of a frosted light bulb.
Continue reading Why do waterfalls appear white in colour ?