Transport
Discover facts about transport. Small discoveries that change the way you see familiar things.
Transport
Why tractor exhaust pipes point upward
A tractor’s tall exhaust stack sends fumes up and away from the operator working beside the engine. The smoke gets its own exit route instead of joining the…
Discover more
Why logging trucks carry their own trailers
The load itself helps solve the problem: long logs stretch between the truck and a rear trailer, while the trailer’s pole folds up for the empty drive back.…
Discover more
Why Scottish bus drivers can ban bagpipes
Transit rules let drivers refuse passengers trying to busk with bagpipes. Their volume can overwhelm a crowded bus.
Discover more
Bulldozer ripper claws physically shatter the earth
A bulldozer’s ripper drives a steel tooth into hard ground, concentrating the machine’s weight on a tiny point. Rock that shrugs off a broad blade cracks…
Discover more
Rowboat oars function as massive physical water levers
The oarlock acts as a fulcrum, letting the long oar turn a small pull at the handle into a strong push against the water. Push water backward, and the boat…
Discover more
The first flight attendants were all men
Early airlines hired men as stewards, drawing on the seafaring tradition of male cabin staff. Once airlines wanted passengers to see flying as safe and…
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.
An orbital tether could trade one spacecraft's altitude for another's
Connect two objects with a long tether and release them at the right moment, and their different motions can send them onto different orbits. One gains…
Discover more
Tandem bicycles force the rear rider to stare at a back
Both riders face forward, so the front cyclist gets the scenery and the rear cyclist gets a close-up of a human back. Tandem seating keeps both riders…
Discover more
Tunnels require massive ceiling fans to clear exhaust
Fans push polluted air toward tunnel portals, where it escapes instead of pooling around traffic. In a fire, ventilation systems also steer smoke away from…
Discover more
Riding hands-free does not mean the bicycle stops steering
The bike still makes small steering movements as it balances, and a rider can influence them by shifting weight. Hands on the bars provide more direct control…
Discover more
Most helicopters leave the atmosphere outside in charge
An unpressurized cabin follows the surrounding air pressure, which falls as the aircraft climbs. Avoiding a pressurization system saves weight, but altitude…
Discover more
The WWII aircraft that glided silently into battle
A military glider had no engine to announce its arrival: a tow plane pulled it near the target, then released it to glide in quietly. Troops and equipment…
Discover more
Military submarines are painted black to hide in deep water while research vessels use bright yellow
A dark submarine hull blends into the dim water around it, while a research vessel needs to stand out so people spot it easily. One is trying to disappear;…
Discover more
Two turn signals can agree briefly, then drift apart
Each car runs its own timing circuit, with small differences in blink rate. The signals can line up for a moment before one gradually gains on the other.…
Discover more
Helicopter halos can be sparks from the rotor itself
In sandy conditions, grains strike fast-moving blades and erode tiny metal fragments. Some of that material burns as it reacts with oxygen, tracing bright…
Discover more
Conestoga trailers use a rolling tarp cover
The tarp rides on a frame that rolls forward or back, so loaders reach the cargo without wrestling a huge sheet by hand. Pull it closed and the load is…
Discover more
Passport stamps once helped track epidemics
A passport stamp records where a traveler was and when. During an outbreak, that ink trail gave officials a rough map of who had crossed paths with an…
Discover more
Why pioneers walked beside their wagons
A loaded wagon moved at the pace of its draft animals, and a person on foot could guide the team around ruts and obstacles. Walking also left the wagon room…
Discover more
Why walkers wear tennis balls
Tennis balls over a walker’s rear legs soften the contact with the floor and help the frame glide instead of scrape. The walker gets smoother movement by…
Discover more
Snow is part of a snowmobile's cooling system
Snow helps lubricate and cool the contact between a snowmobile's track and slide rails. Many liquid-cooled models also depend on snow reaching heat exchangers…
Discover more
English Channel foot ferries cross one of the busiest waters
A ferry crossing the Channel has to share water with ships following busy traffic lanes. The crew tracks those ships and crosses on a controlled route; it’s…
Discover more
Why spacecraft shake violently on the way to orbit
Rocket engines rumble through the vehicle while fast-moving air buffets it on the way up. Those vibrations shake the cabin, and the structure flexes to absorb…
Discover more
The driver merging late may be helping traffic
Using both lanes up to the bottleneck and taking turns to merge makes better use of the road. Blocking late mergers can make the backup worse.
Discover more
The VW bus began with a sketch of a factory workhorse
Dutch importer Ben Pon saw a vehicle moving parts around Volkswagen's factory and sketched the idea for a compact transporter in 1947. The resulting Type 2…
Discover more