Science

Colgate Dental Cream (Toothpaste) With Gardol - ca. 1950s (Photo: Wikimedia/Thistle33)

When was toothpaste invented?

From ashes of ox hooves, eggshells, pumice, and myrrh to fluoride and sodium lauryl sulfate, the history of toothpaste has come a long way in 7000 years.

Deafening silence (Photo: Unsplash/ Kristina Flour)

What Is A Deafening Silence?

A deafening silence is the absence of sound, but it’s the noise that comes before it that really makes it deafening. You can only appreciate the silence because of the noise beforehand.

Clouds are made up of air and water. When light passes through a cloud, the water droplets scatter the light reflected from the sun. (Photo: PxHere)

Why Are Clouds White?

The answer to the question “Why are clouds white?” lies in how different-sized particles scatter the light that passes through clouds.

Lightning storm (Photo: Wikimedia/Jan Bambach)

Dark Lightning: A Cosmic Force on Earth

Mostly invisible to the naked eye, dark lightning produces enormous bursts of gamma rays that create showers of electrons and positrons, the electrons’ anti-matter equivalent.

Call of the void or High-place phenomenon is experienced by around 50% of people during their lifetime. (Photo: Pixabay)

The Call of the Void and its Perilous Lure

Some people experience a compulsion to step off the edge of high places. This illogical urge is called l’appel du vide by the French but translates into English as the more ominous-sounding call of the void.

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