Did You Know? | Interesting facts about the world around us.

Posted by Between the Lines • Profile • 09/16/26 at 01:30AM • Curiosity & Discovery • See more by Between the Lines

Did You Know? | Kudos365 Curiosity Series

1. Octopuses have three hearts.
Two hearts pump blood through the gills, while a third circulates it through the rest of the body. Their blood also uses a copper-containing protein called hemocyanin to transport oxygen, giving it a bluish appearance.

2. The Moon is slowly moving away from Earth.
Measurements made using reflectors left on the lunar surface show that the Moon is receding from Earth by about 3.8 centimeters—roughly 1.5 inches—per year. Over immense spans of time, this gradual change affects the Earth-Moon system and the length of Earth's day.

3. Bananas are berries, botanically speaking—but strawberries aren't.
Botanical definitions don't always match everyday language. A banana develops from a single flower with one ovary and meets the botanical requirements for a berry. A strawberry is an aggregate accessory fruit, with the small seedlike structures on its exterior actually being individual fruits.

4. The Pacific Ocean is wider than the Moon.
The Moon's diameter is about 2,159 miles (3,475 kilometers). The Pacific Ocean spans many thousands of miles at its widest extent. The comparison sounds surprising because we instinctively think of the Moon as enormous and an ocean as merely a feature on Earth's surface.

5. Some bamboo can grow nearly three feet in a single day.
Certain bamboo species are among the fastest-growing plants known. Under favorable conditions, documented growth rates can approach about 90 centimeters—roughly 35 inches—in 24 hours. Much of this remarkable growth comes from rapidly elongating sections of an already established plant.

6. The fingerprints of koalas can look remarkably similar to human fingerprints.
Koalas have ridged fingertips with loops, whorls, and other patterns that strongly resemble those found on human fingers. These similarities evolved independently, making them an interesting example of unrelated species developing comparable biological features.

7. The Sahara has not always been a vast desert.
Several thousand years ago, parts of today's Sahara contained grasslands, lakes, rivers, and abundant wildlife. Changes in Earth's orbital patterns altered African monsoon rainfall, helping transform this much greener landscape into the extremely arid environment familiar today.

8. The first known vending machine dates back nearly 2,000 years.
The ancient engineer Hero of Alexandria described a coin-operated device that dispensed a measured amount of holy water. Dropping a coin onto a small internal mechanism temporarily opened a valve. The principle—insert payment and automatically receive something—would be perfectly recognizable to a modern vending-machine user.

Sometimes the familiar world becomes much more interesting when we look a little closer: Explore. Discover. Learn.