1. Octopus blood is blue.

Because it contains copper-based hemocyanin, it has three times the oxygen-carrying efficiency of human iron-based hemoglobin, making it essential for survival in the low-temperature deep sea.

2. Honey never spoils.

Honey found in the Egyptian pyramids dating back 3,300 years is still edible; its high sugar content and low moisture content inhibit bacterial growth.

3. Bananas are herbaceous plants.

The banana tree is actually a giant herb with a stem wrapped in leaf sheaths, and the entire plant dies after bearing fruit once.

4. Polar bear fur is transparent.

Each hair has a hollow structure that reflects sunlight, making it appear white to the naked eye, while the skin is actually pure black.

5. Ants have a sense of smell 20 times stronger than dogs.

Its antennae have 400 olfactory receptors, enabling it to identify sugar molecules up to 1 kilometer away and precisely locate food.

Magnified ant head

6. The human brain cannot imagine new colors.

All visual perception is based on the combination of the three primary colors: red, green, and blue. The so-called "new colors" are just adjustments in proportion.

7. The material of RMB banknotes is cotton.

Contains 95% cotton linters and 3% wood pulp, resists over 30,000 folds, and can still be used after being soaked in water and dried.

8. The moon is moving away from the earth.

Each year, it escapes 3.8 centimeters, and in 1 billion years, Earth will no longer have total solar eclipses, only annular solar eclipses.

9. Kangaroos do not walk backwards.

The kangaroo on the Australian coat of arms symbolizes "never going backwards" because its hind limbs limit its ability to jump forward.

10. Owls' eyes don't rotate.

Its neck can rotate 270° to supplement its field of vision, and its auditory positioning error is less than 1 degree, making it invincible for night hunting.