All facts — Page 84

Every second, 4 babies are born and 2 people die in the world.

World population grows about 80 million per year. We are currently over 8 billion people.

The human brain has more connections than stars in the Milky Way.

The brain has about 100 trillion synapses, while the Milky Way has 100-400 billion stars.

The Sun will lose the ability to sustain life on Earth in about 500 million years.

As the Sun ages, it becomes brighter and hotter, making Earth uninhabitable long before it becomes a red giant.

Crows can solve multi-step puzzles.

Studies showed crows can use tools in sequence to obtain food, demonstrating planning.

The human body produces about 2 liters of mucus per day.

Mucus protects the lungs, digestive tract and nasal passages from irritants and infections.

The human body has enough iron to make a 7.5 cm nail.

Iron is mainly in hemoglobin. Without it, blood couldn't transport oxygen.

All other planets of the solar system fit in the space between Earth and Moon.

The average Earth-Moon distance is 384,400 km. Adding all planet diameters, the total is about 380,000 km.

Domestic cats share 95.6% of their DNA with tigers.

Cats and tigers share a common ancestor and many behaviors, including hunting and territory marking.

The Sahara was a tropical ocean 50 million years ago.

Marine fossils found in the Sahara desert confirm the region was covered by a sea.

The human brain is more active at night than during the day.

Neuroimaging studies show that during sleep, especially REM phase, the brain processes information intensely.

A lobster's heart is in its head.

Like shrimp, lobsters have their heart located in the head region, near the stomach.

The sunlight we see now left the Sun 8 minutes ago.

Light travels at 300,000 km/s, but the Sun is 150 million km away. However, light took 100,000 years to exit the…

Diamond is made of the same material as pencil graphite.

Both are made of pure carbon. The difference is in crystal structure: diamond has atoms arranged more compactly.

Every day, the human body loses and replaces millions of skin cells.

The human body loses about 30,000 to 40,000 dead cells per hour — about 1.5 kg of skin per year.

Male seahorses get pregnant and give birth.

The male has a pouch where the female deposits eggs. He fertilizes them and carries them until birth.

The human stomach has acid strong enough to dissolve metal.

Stomach hydrochloric acid has pH 1-2, similar to battery acid. It's strong enough to corrode zinc and iron.

The human mouth has more bacteria than people in the world.

The human mouth hosts about 700 species of bacteria and billions of individuals.

The Milky Way has a supermassive black hole at its center.

Sagittarius A* has about 4 million solar masses. It was first photographed in 2022.

Bees can count up to 4.

Studies have shown bees can distinguish small quantities and understand the concept of zero.

The human body has about 60,000 km of nerves.

The human nervous system is a vast network connecting the brain to all parts of the body.

Earth has two temporary natural satellites besides the Moon.

Tiny asteroids are occasionally captured by Earth's gravity and orbit it temporarily before escaping.

The Sun is a middle-aged yellow-white star.

The Sun is about 4.6 billion years old — approximately halfway through its expected life.

Honey is the only food that never spoils.

Thanks to its low water content and acidic pH, honey is a hostile environment for bacteria and fungi.

The human body glows in the dark — it's bioluminescent.

The body emits very faint light, 1,000 times less intense than the human eye can see. It's strongest on the face and…