This is “Did You Know”. Facts that are hard to believe. Short explanations for things you always wanted to know. For example, did you know that Napoleon wasn’t really that short and that frogs don’t drink? Here are more facts that you probably haven’t heard before. Those interesting facts are about basically everything.

1 - Did you know each insect is a host to ten bacterial species?
There are around 2 billion species on Earth—with 6.8 million likely to be species of insects. And up to 10 types of bacteria lives inside of each of these insects!

2 - Did you know instrument strings were made from animals?
The strings of string instruments were originally made from the guts of animals like sheep or lambs. Now, instrument makers have transitioned to metal wiring. But before metal, it was common for all string instruments to be made from the guts of the animals geographically available to the makers.

3 - Did you know Queen Elizabeth II keeps track of when she wore each outfit?
It’s rumored that Queen Elizabeth never wears the same hat twice. If she does, she waits years to wear one again, and evidently, there’s a spreadsheet recording her exact outfit each day. So, what does she do with all of those hats?

4 - Did you know some common hand gestures are offensive in other countries?
The “devil horns” hand sign seen thrown up at rock concerts can be offensive in other countries. In European and South American countries, this hand sign implies that a man’s wife has been unfaithful. The meaning dates back to the etymological meaning of “cuckold” which is “horned” in Italian, Spanish, and Greek.

5 - Did you know 40 percent of human jobs could be replaced by AI in the future?
In about 20 years, the future could look eerily similar to Wall-E. Artificial intelligence expert Kai-Fu Lee said that 40 percent of human jobs could be replaced by equally capable robots. And drivers might be affected the most.

6 - Did you know Disneyland has an underground tunnel system?
There are lots of quirky things that some think are underneath Disney parks, but these literally are! The tunnels were built in response to characters having to run through other lands to get to their posts, which spoiled the magic.

7 - Did you know your body loses up to 8 percent of water on a flight?
Water is our body’s mechanical oil—without it, it can’t function. You lose about 8 percent of your body water while on a flight. This is because the humidity in the climate-controlled environment can be as low as 10 to 15 percent.

8 - Did you know trees can communicate?
Trees talk. Their roots are connected through an underground network of fungi, nicknamed the “Wood Wide Web,” that allows them to share resources with each other. They “talk” by transmitting nutrients to one another through the fungi. For instance, a mother tree, or oldest and strongest tree in the forest, will share some of her sugars with smaller, nearby trees.

9 - Did you know people rarely used to smile in photos?
Why do people smile when they have their photo taken? Smiling in photos is said to have originated from a Kodak advertising scheme that focused on capturing moments of happiness with the product. Since then, it’s been the norm to grin into the camera. A study comparing yearbook photos from 1905 to 2005 showed an increase of lip curvature over time.