All facts — Page 48

The 'SOS' signal does not mean 'Save Our Souls'.

It was chosen only for its simplicity in Morse code (three dots, three dashes, three dots), making its transmission…

Easter Island got its name from the day of its discovery.

Dutch explorers spotted and landed on the island on Easter Sunday in 1722, immediately naming it after the date.

The Mona Lisa has no eyebrows or eyelashes.

Experts believe Da Vinci never painted them or that, due to the canvas's age and old cleanings, the hairs disappeared.

World War I only officially ended in 1990.

Although fighting ceased in 1918, the definitive peace treaty with Germany was only signed in 1990 after the…

Mozart wrote his first symphony at age 8.

The Austrian prodigy demonstrated extraordinary musical talent from childhood, composing complex works long before…

The Great Wall of China is not visible from space.

Contrary to myth, the structure is too narrow to be seen from low Earth orbit without optical aid.

Napoleon was once attacked by rabbits.

During a hunt, domesticated rabbits mistook the carriage for food and attacked the emperor and his men en masse.

About 8 million insect species remain undiscovered.

Scientists estimate that the vast majority of the planet's biodiversity consists of insects, of which only a fraction…

Black holes slow down time.

According to Einstein, the immense gravity of a black hole distorts spacetime, making time pass slower near it.

95% of the universe is dark matter and energy.

Everything we know and see constitutes only 5% of the universe; the rest is invisible and remains a mystery.

There are more atoms in a glass of water than glasses of water in the oceans.

There are countless molecules in a 250ml glass compared to the number of glasses needed to fill all the world's…

The human brain is 75% water.

Water is essential for electrical impulses and chemical reactions, meaning dehydration directly affects reasoning.

We blink about 28,800 times a day.

This equals over 10 million blinks a year, a reflex action essential to clean and lubricate the eyes.

The eyes can distinguish 10 million colors.

Cones in the retina allow us to perceive a vast chromatic spectrum, processed uniquely by each brain.

The heart beats about 100,000 times a day.

This results in pumping approximately 7,500 liters of blood daily throughout the body.

Oysters can change sex.

Many species are sequential hermaphrodites, changing sex depending on water temperature and reproduction needs.

Penguins can drink salt water.

They have a supraorbital gland that filters excess salt from the blood, which is expelled through the beak.

Dogs have fingerprints on their noses.

The texture of a dog's nose skin is unique, just like human fingerprints, and can be used for ID.

Cats sleep 70% of their lives.

This behavior is due to their instinct to conserve energy for hunting.

Flies taste their food with their feet.

They have taste receptors on their legs, allowing them to know if something is edible as soon as they land.

Giraffes sleep very little.

In the wild, they sleep 30 minutes to 2 hours a day in short naps to stay vigilant against predators.

Sharks are older than trees.

Sharks have swum in the oceans for 400 million years, while the first trees appeared 350 million years ago.

Crocodiles cannot stick out their tongues.

Their tongue is firmly attached to the bottom of the mouth by a membrane, preventing free movement.

Platypuses have no stomach.

The esophagus connects directly to the intestines. Also, females "sweat" milk through their skin.