Two important factors influence the shape of snowflakes. One is the ambient temperature, and the other is humidity. A snowflake needs to grow under the condition of a super saturated environment.
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How does the epiglottis distinguish between water, food and air?
Swallowing is one of the most obvious functions the epiglottis serves, because it hoods over the airway, or larynx, when you eat and drink. When you swallow, the muscles in your throat respond by pulling the voice box up and underneath the tongue, and the epiglottis is pulled to cover over the larynx.
Can all mosquitos transmit viruses like Zika?
Not all mosquitos can transmit the Zika virus, and that’s the case with any mosquito-borne pathogen. There are about 3,000 species of mosquitos in the world and only a handful—about 150—are considered vectors of pathogens, capable of spreading viruses.
Why do we have freckles?
Freckles are composed of an ingredient called melanin, which protects against damage caused by UV light. Your body makes melanin to protect itself from sun damage.
How does thunder form?
Thunder is formed by the intense heating produced by lightning. The thunder you hear is made up of vibrations that travel as sound waves through the air until they reach your ear.