1288 questions and answers in this section
Explain why does the moon not fall onto Earth due to gravity?

Explain why does the moon not fall onto Earth due to gravity?

Earth's gravity acts on the Moon much like an invisible string that keeps an object revolving around itself when you spin it with your arm. This attractive...

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Explain why glass is translucent while metal is not.

Explain why glass is translucent while metal is not.

Glass is primarily a material that is classified as amorphous solid. This means that its atoms are arranged in a rather disordered manner, as if...

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Explain why mosquitoes prefer to bite certain people over others?

Explain why mosquitoes prefer to bite certain people over others?

Mosquitoes primarily locate their targets through the carbon dioxide (CO2) we exhale while breathing. Some people naturally emit more CO2 than others: for example, taller...

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Explain why Galileo was condemned by the Inquisition for his astronomical discoveries?

Explain why Galileo was condemned by the Inquisition for his astronomical discoveries?

At the time of Galileo, the Catholic Church adopted a literal interpretation of certain biblical passages. For it, texts like the one where Joshua stops...

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Explain why supermarket tomatoes have no taste.

Explain why supermarket tomatoes have no taste.

Tomatoes intended for supermarkets travel a lot, sometimes thousands of kilometers. They are therefore stored at low temperatures to maintain their freshness. The problem is...

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Explain why dogs have such a highly developed sense of smell?

Explain why dogs have such a highly developed sense of smell?

The dog's nose has up to 300 million olfactory cells, compared to only about 5 million in humans. Its nasal cavity has a very large...

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Explain why compasses point north?

Explain why compasses point north?

The geographic North is simply where all our meridians meet: right at the top of the Earth, on the axis of rotation of our planet. The magnetic...

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Explain why cacti can survive in arid environments?

Explain why cacti can survive in arid environments?

Cacti have particular shapes, perfectly adapted to drought, such as their thick and fleshy stems. This shape allows them to store a lot of water, a perfect...

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Explain why glaciers are melting due to climate change.

Explain why glaciers are melting due to climate change.

For over a century, the average temperature on Earth has been rising rapidly, primarily due to human activity. This global increase is causing accelerated melting...

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Explain why onions make eyes water when cutting them?

Explain why onions make eyes water when cutting them?

The onion is primarily composed of water (about 90%), but what interests us most here is sulfur. The onion contains compounds called amino acid sulfoxides, stored in...

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