Transport
Discover facts about transport. Small discoveries that change the way you see familiar things.
Transport
Bicycles use wire spokes under enormous tension
A bicycle wheel is held together by spokes pulled tight between hub and rim. The wheel’s load changes their tension as it rolls, letting a surprisingly…
Discover more
Bicycles use a freewheel to let riders stop pedaling
Inside the rear hub, a ratchet lets the wheel keep turning while the pedals stand still. Its little pawls click past the gears, so coasting sounds like the…
Discover more
Rollerblades feature a dedicated rubber brake on the heel
A heel brake works when the skater lifts the toe and presses the brake pad against the ground. The rear foot becomes a lever, turning a small change in…
Discover more
How gliders stay aloft without engines
A glider’s wings turn forward motion into lift, while rising air gives it fresh altitude. Pilots circle in warm-air updrafts called thermals, trading a little…
Discover more
How quickly a skydiver stops speeding up
At first, gravity pulls a skydiver downward faster than air resistance can push back. As speed builds, drag grows until it balances the fall; the skydiver…
Discover more
How summer heat buckles steel railroad tracks
Steel expands as it heats, but rails fastened to ties cannot simply lengthen in place. The resulting compression can shove a track sideways into a buckle, so…
Discover more
STACKY FOR IPHONEA bigger world.
One discovery
at a time.
Keep discovering with Stacky. Interesting facts in an app that is always within reach.
A chicken's longest recorded flight lasted 13 seconds
That flight covered about 300 feet, but it was a brief burst of flapping rather than sustained flight.
Discover more
An airbag has less than a blink to do its job
NHTSA describes inflation taking less than one-twentieth of a second. A crash sensor triggers the inflator, creating a cushion before the occupant strikes the…
Discover more
This parachute brings down the whole airplane
Cirrus aircraft can carry a rocket-deployed parachute attached to the airframe. Once deployed within its operating limits, it lowers the aircraft with the…
Discover more
End portals demand specific glowing orbs
An Eye of Ender leads players toward a stronghold, where its matching frame surrounds the End portal. Slot in the glowing orbs and the gateway wakes up:…
Discover more
Shimmering ponds transport users to cursed woods
The pond is the ride’s doorway: a boat glides across the reflective water, and the trees on the far bank seem to rise straight out of the shimmer. By the time…
Discover more
Nether portals require dark obsidian frames
Obsidian makes the portal’s frame; lighting it fills the opening with a purple gateway. In Minecraft, the doorway doesn’t need hinges, a handle, or even a…
Discover more
Room of requirement tunnels adapt to user needs
The Room of Requirement reshapes itself around what the person entering needs, so its hidden routes and spaces serve the task at hand. A passage for escape, a…
Discover more
Mirror dimensions hide destructive magical fights
In Doctor Strange’s Mirror Dimension, sorcerers bend a copy of the world without wrecking the real one. Buildings fold and streets twist inside the hidden…
Discover more
Dimension doors open instantly to visible spots
The destination has to be visible: the doorway skips the distance, not the need to know where you’re stepping. It’s teleportation with a strict “look before…
Discover more
Green pipes bypass normal spatial boundaries
The pipe works as a shortcut because the game connects its mouth to another location, rather than making the character cross every bit of ground in between.…
Discover more
Magic flutes instantly shift your location
The flute doesn’t speed up the journey; its magic skips the distance altogether, dropping the player at another place when the tune ends. Somewhere, a train…
Discover more
Boom tubes create pathways across the cosmos
In DC stories, a boom tube opens a portal between distant places, letting people cross without traveling through the space in between. It’s interstellar…
Discover more
Ender pearls teleport you where they shatter
In Minecraft, throwing an Ender pearl sends it toward the impact point; when it lands, the player teleports there and takes damage. The pearl is a tiny…
Discover more
Ruby slippers demand three distinct clicks
Dorothy clicks her heels three times as a simple ritual to call on the slippers’ magic and return home. The spell gets no control panel; it gets a very…
Discover more
Eldritch sparks trace circular glowing gateways
As a wheel turns, sparks shoot from its edge and trace its rotation. A camera’s long exposure blends those flashes into a bright circle—an otherworldly…
Discover more
Cosmic cubes can open portals across space
In Marvel stories, the Tesseract holds the Space Stone, which bends space to open a doorway between distant places. A cube turns a vast journey into one step…
Discover more
Glowing blue stones manipulate pure space
Charged particles racing through ice faster than light travels through ice produce a blue flash called Cherenkov radiation. Buried sensors catch the glow and…
Discover more
Silver knives cut windows into alternate worlds
The blade finds a seam between worlds and slices it open like a paper cut in reality. Silver does the delicate work; the universe supplies the doorway and,…
Discover more