Curious minds never stop learning. That’s why we feature a fresh Fact of the Day—a quick, engaging piece of knowledge updated daily to spark your interest before you jump into the quiz. It’s short, surprising, and just enough to make you say, “I didn’t know that!”
Fact of the Day — October 24, 2025
The Eiffel Tower can grow more than 6 inches taller in summer. Because it’s made of iron, the metal expands in heat and contracts in cold. During hot summer days, thermal expansion can make the tower noticeably taller, while in winter it slightly shrinks back down.
Fact of the Day — October 23, 2025
Octopuses have three hearts and blue blood. Two hearts pump blood to the gills, while a third circulates it through the body. Their blue color comes from hemocyanin, a copper-based molecule that carries oxygen more efficiently in cold, low-oxygen water.
Fact of the Day — October 22, 2025
Turritopsis dohrnii, also known as the “immortal jellyfish,” can essentially reverse its own aging. When injured or stressed, it can revert its adult cells back into a younger, polyp stage and start its life cycle all over again. While it doesn’t make them invincible, it means they can potentially avoid natural death and live indefinitely under the right conditions.
Fact of the Day — October 21, 2025
Honeybees can recognize human faces. Despite having brains the size of a sesame seed, honeybees can remember and distinguish individual human faces using a pattern-recognition system similar to ours. In scientific experiments, bees were trained to associate certain faces with rewards — and they remembered them even days later.
Fact of the Day — October 20, 2025
Sea cucumbers can dissolve their bodies and regenerate. When threatened, they expel their organs to scare predators, then grow them back over time — a remarkable survival mechanism.
Fact of the Day — October 19, 2025
Bananas are naturally slightly radioactive. Because they contain potassium — and a small portion of that is the radioactive isotope potassium-40 — bananas emit trace levels of radiation. Don’t worry, though — you’d have to eat millions at once for it to be harmful!
Fact of the Day — October 18, 2025
Koalas have fingerprints almost identical to humans. Even under a microscope, their prints are hard to distinguish from ours — which has actually confused crime scene investigators.
Fact of the Day — October 17, 2025
There’s enough DNA in the human body to stretch from the Sun to Pluto — and back — 17 times. All the DNA in your cells, uncoiled and lined up, would stretch billions of kilometers.
Fact of the Day — October 16, 2025
Hot water freezes faster than cold water — under certain conditions. This phenomenon is called the Mpemba effect, and scientists are still studying why it happens.
Fact of the Day — October 15, 2025
Jellyfish don’t have brains, hearts, or bones. They’re made up of a simple network of nerves and about 95% water — but some species have existed for more than 500 million years.
Fact of the Day — October 14, 2025
A group of flamingos is called a “flamboyance.” Their bright coloring and synchronized movements inspired the name.
Fact of the Day — October 13, 2025
Cats can’t taste sweetness. They lack the necessary taste receptor gene (Tas1r2), so sugary foods don’t appeal to them the way they do to humans.
Fact of the Day — October 12, 2025
The Eiffel Tower grows in the summer. Due to thermal expansion, the iron structure can grow up to 6 inches (15 cm) taller in hot weather.
Fact of the Day — October 11, 2025
Nutmeg can be toxic in large amounts. It contains myristicin, which in high doses can cause hallucinations, nausea, and dizziness.
Fact of the Day — October 10, 2025
Cows have best friends. Studies show they form close bonds and get stressed when separated from their preferred companions.
Fact of the Day — October 9, 2025
Scotland’s national animal is the unicorn. It was chosen in the 12th century as a symbol of purity, strength, and untamed spirit.
Fact of the Day — October 8, 2025
Sloths can hold their breath longer than dolphins. They can slow their heart rate and stay underwater for up to 40 minutes — while dolphins typically last about 10 minutes.
Fact of the Day — October 7, 2025
A day on Venus is longer than a year on Venus. The planet takes 243 Earth days to rotate once on its axis, but only 225 Earth days to orbit the Sun.
Fact of the Day — October 6, 2025
There’s a planet where it rains glass — sideways. Exoplanet HD 189733b has winds over 5,000 mph and particles of glass in the atmosphere, making the rain incredibly sharp and deadly.
Fact of the Day — October 5, 2025
Wombat poop is cube-shaped. The unusual shape prevents it from rolling away, helping wombats mark their territory more effectively.
Fact of the Day — October 4, 2025
Octopuses have three hearts. Two pump blood to the gills, while the third pumps it to the rest of the body. And when an octopus swims, that third heart actually stops beating!
Fact of the Day — October 3, 2025
Sharks are older than trees. Sharks have existed for around 400 million years, whereas the first trees appeared about 385 million years ago — meaning sharks were swimming in the oceans long before forests existed.
Fact of the Day — October 2, 2025
Honey never spoils. Archaeologists have found pots of honey in ancient Egyptian tombs that are over 3,000 years old — and still perfectly edible thanks to honey’s low moisture, high acidity, and natural preservatives.
Fact of the Day — October 1, 2025
Bananas are naturally slightly radioactive. Because they contain potassium — and a small portion of that is the radioactive isotope potassium-40 — bananas emit trace levels of radiation. Don’t worry, though — you’d have to eat millions at once for it to be harmful!