Old Faithful erupts about every 90 minutes, which is why it got its name.
Yellowstone was the very first national park in the entire world, back in 1872.
The whole park sits on top of a giant volcano that is still awake.
Grand Prismatic Spring is rainbow colored because different bacteria like different temperatures.
Bison are the biggest land animals in North America, and they can run 35 miles per hour.
There are more than 10,000 hot springs and geysers here, more than anywhere on Earth.
Wolves were brought back to Yellowstone in 1995 and changed the whole park.
A geyser is just a hot spring that gets plugged up until it finally bursts.
Yellowstone is bigger than the states of Rhode Island and Delaware put together.
The park's grand canyon has yellow rock, and that is how Yellowstone got its name.
Elk bugle in the fall, and the sound carries for more than a mile.
Never step off a boardwalk near a hot spring. The crust is thin and the water boils.
Grizzly bears can smell food from miles away, which is why food goes in lockers.
Yellowstone Lake is so high up that the water almost never gets warm.
Mammoth Hot Springs builds new rock terraces every single day, like a slow fountain.
Trumpeter swans are the heaviest flying birds in North America and they nest here.
Yellowstone sits in three states at once: Wyoming, Montana, and Idaho.
Steamboat Geyser is the tallest in the world and shoots higher than a 30 story building.
Airplane wings are built to bend and flex in rough air, and that is on purpose.
The little hole in an airplane window keeps the pressure safe and stops fogging.
Pilots and copilots are usually served different meals in case one gets sick.
A jet engine sucks in enough air every second to fill a hot air balloon.
Your suitcase gets a barcode tag that computers read more than ten times per trip.
Airport runways have numbers that tell pilots which direction they point.
The window seat is the coldest seat on a plane because the wall touches outside air.
Air traffic controllers watch thousands of planes at once and keep them all apart.
Chewing gum or yawning helps your ears pop when the plane climbs or lands.
Most planes fly higher than the clouds, which is why it is sunny up there.
A plane's black box is actually bright orange so it is easier to find.
Food tastes less salty and sweet on a plane, so airlines season it extra.
The fastest a passenger jet usually flies is around 575 miles per hour.
Every airport in the world has its own three letter code, like a nickname.
Packing cubes let you fit more clothes because squished clothes take up less room.
Roll your clothes instead of folding them and they wrinkle less in a suitcase.
Maps used to be drawn by hand, and mapmakers sometimes guessed at the edges.
A compass needle always points north because Earth itself works like a giant magnet.
Time zones exist so the sun is overhead around noon almost everywhere on Earth.
The word vacation comes from a Latin word that simply means to be empty.
Postcards were invented in the 1860s and were cheaper to send than letters.
Souvenir is a French word that means to remember, which is exactly the point.
Travel journals help you remember small details your photos never manage to catch.
Some hotels give kids their own tiny robe and slippers if you ask nicely.
Counting license plates from different states is the oldest road trip game there is.
Sunscreen needs about fifteen minutes to start working before you get in the water.
Drinking extra water on a plane helps, because cabin air is drier than a desert.
A paper map does not need batteries, which is why sailors still carry them.
Passports have tiny hidden pictures that only show up under a special blue light.
The best souvenir is usually the cheapest one, because you actually keep using it.
Old Faithful erupts about every 90 minutes, which is why it got its name.
Yellowstone was the very first national park in the entire world, back in 1872.
The whole park sits on top of a giant volcano that is still awake.
Grand Prismatic Spring is rainbow colored because different bacteria like different temperatures.
Bison are the biggest land animals in North America, and they can run 35 miles per hour.
There are more than 10,000 hot springs and geysers here, more than anywhere on Earth.
Wolves were brought back to Yellowstone in 1995 and changed the whole park.
A geyser is just a hot spring that gets plugged up until it finally bursts.
Yellowstone is bigger than the states of Rhode Island and Delaware put together.
The park's grand canyon has yellow rock, and that is how Yellowstone got its name.
Elk bugle in the fall, and the sound carries for more than a mile.
We leave for Yellowstone today. Go go go!
Never step off a boardwalk near a hot spring. The crust is thin and the water boils.
Cut along the lines. Loop the highest number first, then thread each new strip through the last one before taping it closed.
