From Nut-Smashing Birds to Swimming Elephants

How Crows Crack Nuts
Crows are incredibly smart. When they come across nuts they can’t break open themselves, they sometimes drop them onto busy roads. Then they wait for a car or even a person to crush the nut so they can enjoy the treat inside.

When Fog Becomes Dangerous
Not all fog is harmless. "Smog" is a mix of smoke and fog, caused by heavy air pollution combined with humid air. This kind of fog can be very harmful to your lungs and breathing.

Yes, Elephants Can Swim!
Elephants aren’t just big, they’re great swimmers too. They even dive underwater, using their trunks like snorkels so they can breathe while the rest of their body is underwater.

The Pressure Cooker: A 340-Year-Old Invention
The first pressure cooker was invented around 340 years ago but it wasn’t very safe back then. At high temperatures, it could explode! Today’s pressure cookers are designed with a special safety valve to release extra pressure and keep them safe.

Two Niles, Two Colors
The Nile River has two main branches: the White Nile and the Blue Nile. The White Nile looks almost white, even when it flows through muddy swamps. The Blue Nile, on the other hand, has the more typical blue-green look we see in rivers.

Oil Is Found in Traps
Oil, one of the most useful resources in the world, isn’t found just anywhere. It’s hidden in special rocks that block its movement, called "oil traps." Once found, people drill into the rock to collect the oil.