The world is full of surprising things that can sound completely made up at first. From animals with unusual abilities to planets where a day lasts longer than a year, reality can sometimes be stranger than fiction.

Here are seven fascinating facts that sound unbelievable — but are actually true.

1. A Day on Venus Is Longer Than a Year

Venus rotates extremely slowly.

It takes about 243 Earth days for Venus to complete one rotation on its axis, while it takes around 225 Earth days to orbit the Sun.

That means a single day on Venus is longer than an entire Venusian year.

Pretty strange, right?

2. Octopuses Have Three Hearts

An octopus doesn’t have just one heart.

It has three.

Two hearts help pump blood through the gills, while the third sends blood throughout the rest of the body.

Even more interesting, the main heart temporarily stops beating when the octopus swims.

3. Wombats Produce Cube-Shaped Poop

Yes, this one is real.

Wombats are one of the only known animals that produce cube-shaped droppings.

Their intestines compress the material in a unique way, creating the unusual shape.

Scientists believe the cubes also help prevent the droppings from rolling away when wombats use them to mark their territory.

4. Sharks Existed Before Trees

Sharks are incredibly ancient animals.

The earliest shark ancestors appeared more than 400 million years ago.

Trees, as we recognize them today, appeared later.

That means sharks were swimming in Earth’s oceans millions of years before forests covered the land.

5. Antarctica Is the World’s Largest Desert

When most people think of a desert, they imagine hot sand and scorching temperatures.

But a desert is actually defined by how little precipitation it receives.

Because Antarctica receives very little rain or snow each year, it is considered a desert — and it is the largest desert on Earth.

6. Bananas Are Berries, but Strawberries Aren’t

Botany can be confusing.

According to the scientific definition of a berry, bananas qualify as berries because of how they develop from the flower.

Strawberries, however, do not.

They are classified as aggregate fruits because the small seed-like structures on the outside develop separately.

So scientifically, a banana is closer to being a berry than a strawberry is.

7. The Eiffel Tower Can Grow Taller During Summer

The Eiffel Tower is made mostly from iron.

When temperatures rise, metal expands.

Because of this thermal expansion, the Eiffel Tower can become several centimeters taller during very hot weather.

When temperatures fall again, the metal contracts and the tower returns closer to its normal height.

The World Is More Interesting Than We Think

Sometimes the most surprising stories aren’t inventions at all.

Nature, science, animals, and even the planets around us are filled with strange details that remind us how much there is still to discover.

The next time something sounds too strange to be true, it might be worth checking — because reality can be surprisingly weird.