A blinding flash of light is one of many effects of flashbang grenades

​How do flashbangs work?

Mar 11, 2020

The noise and the bright light.

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A man with a lingering cough.

​When your cough won’t go away

Jan 07, 2020

Why won't it stop?

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A woman uses a heater. She doesn't want a nosebleed.

​Does heat cause nosebleeds?

Dec 04, 2019

Hot and dry.

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A negative version of the American flag. Visuals like this can be a persistent afterimage in eye

Why do I see afterimages?

Oct 18, 2019

Why the images stay.

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An older person's nose

​Why does my nose change as I age?

Aug 29, 2019

They grow and change.

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