Sweat

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Why does water stay cool in earthen clay pots?

Why does water stay cool in earthen clay pots?

Have you ever had a drink of cool refreshing water from a ‘matka’ or earthen clay pot placed outside? Surprisingly enough, the pots are exposed to blazing sunlight, yet the water within stays so cool. How is that possible? This is because of a physical process known as evaporation. When a liquid changes to a gaseous (or vapour) state without boiling, it is known as evaporation. A matka is made of mud and has many minute pores (extremely small holes)....

Why do Humans Sweat?

Why do Humans Sweat?

It is an annual ritual in most Indian homes. With the onset of summer it is time to bring the rusty, rickety old coolers down from the terrace and get them repaired. The reason is obvious – it is difficult to live through the hot, sweaty Indian summer without an air cooler. But did you know that the human body has its own cooler as well? Think of the times you have travelled in a car....

Can Two People have Identical Fingerprints?

Can Two People have Identical Fingerprints?

I was once watching a detective serial on T.V. where the fingerprints of the suspect are required. The hero invites the villain to his home and offers him a glass of water. The bad guy takes the glass and drinks the water from it. After he leaves the hero dramatically whips out a handkerchief and picks up the glass. His expressions showed that satisfaction at a job well done. At that time, I found it amazing – how can smudges on a glass identify people?...

Mosquito Menace

Mosquito Menace

Guess what besides fat raindrops, rain clouds in Mumbai bring? Those tiny terrors, mosquitoes. Result: nights spent tossing and turning, and swatting the insects. But the next morning you wake up with those tell tale red marks on your arms, pause to think if you took a bath or not the previous night. That’s right. Human sweat turns mosquitoes on more than anything else. Research carried out by scientists in The Netherlands say that mosquitoes are actually quite finicky about whom they sting and never ever nibble at random....

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