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Human saliva contains an enzyme called Amylase, which helps digest carbohydrates, and is also a good indicator of a person's overall health.

The density of fog can be up to 1/3 of a water droplet's weight in respect to the air around it.

The concept of time is subjective, and it's only a human construct to organize our experiences, while the universe itself has no sense of time.

Honeybees are able to recognize human faces, especially if they have previously interacted with the person.

The universe is still expanding, and scientists have observed galaxies moving away from each other with a speed proportional to their distance.

If the Earth stopped rotating, the atmosphere would eventually freeze in place and then slowly collapse onto the surface due to gravity.

The human nose can detect over 1 trillion different scents.

The shortest war in history was between Britain and Zanzibar on August 27, 1896, which lasted only 38 minutes.

The concept of infinity can be explained by the concept of limits in calculus, which allows us to define infinite series and ensure their mathematical legitimacy.

The strength of the human eye can detect light intensities as low as 0.000001 lux.

Dogs can hear sounds at frequencies as high as 40,000 Hz, while humans can only hear up to 20,000 Hz.

The world's largest living organism is a fungus, covering over 2,200 acres in Oregon, USA, and is estimated to be around 2,400 years old.

Fingernails grow faster on the fingers than on the toes.

If a person were to hold their breath, the brain could survive up to 2 minutes without oxygen before irreversible damage occurs.

In some parts of the world, such as Australia, a small insect called a midge can live up to 1 week underwater.

The longest word in the English language has 45 letters and is used to describe a type of bird.

Cancer cells can be identified by their unique characteristics, which can be detected using advanced microscopy techniques.

The fastest recorded human sprinter, Usain Bolt, could run at speeds of up to 27.78 miles per hour.

A species of jellyfish, the Turritopsis dohrnii, is biologically immortal and can regenerate its body from any part.

The universe is made up of more than 70% dark matter and dark energy, which are still not fully understood or observed by scientists.

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