249 questions and answers in this section
Explain why hand sanitizer stings on a small cut?

Explain why hand sanitizer stings on a small cut?

The majority of disinfectant gels are mainly composed of ethyl alcohol (ethanol) or isopropyl alcohol, usually between 60 and 80%. These alcohols have strong antiseptic...

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Explain why do we get sick more often in winter?

Explain why do we get sick more often in winter?

In winter, several viruses, including those of the flu and the cold, survive longer in cold, dry air, making their spread more efficient. The cool...

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Explain why we sometimes wake up with a dry throat?

Explain why we sometimes wake up with a dry throat?

Breathing through the mouth during sleep is a common cause of waking up with a dry throat. Normally, when breathing through the nose, the inhaled...

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Explain why do some people hear buzzing sounds known as tinnitus?

Explain why do some people hear buzzing sounds known as tinnitus?

Your ear works a bit like a very sophisticated microphone. Sound enters, travels through the ear canal, and vibrates the eardrum. These vibrations activate small...

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Explain why the beard grows faster in some men?

Explain why the beard grows faster in some men?

Beard growth depends heavily on hormones, particularly a derivative of testosterone called dihydrotestosterone (DHT). The more DHT you have, the more your facial hair is...

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Explain why we sometimes get goosebumps when listening to a song?

Explain why we sometimes get goosebumps when listening to a song?

Goosebumps are simply a bodily reaction manifested as small bumps on the skin. They appear when the tiny muscles located at the base of each...

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Explain why some people talk in their sleep?

Explain why some people talk in their sleep?

Sleep talking corresponds to talking during sleep, consciously or not, and sometimes even holding real little conversations! Generally, these nighttime utterances are rather brief, difficult...

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Explain why we do not remember all of our dreams?

Explain why we do not remember all of our dreams?

During REM sleep, your brain is hyperactive, almost as much as when you are awake. Certain brain regions, like the amygdala (involved in emotions) or...

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Explain why hot peppers sometimes make you want to cough?

Explain why hot peppers sometimes make you want to cough?

Capsaicin is a natural molecule found mainly in hot peppers; it is what gives them their typically spicy characteristic. When you bite into a pepper, capsaicin directly...

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Explain why some people develop imposter syndrome.

Explain why some people develop imposter syndrome.

The impostor syndrome often finds its roots in childhood. When parents set the bar very high, are demanding, or are rarely satisfied, the child often...

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