stackyFACTS
Customs declaration forms use chemically treated paper
STACKY / Transport
Transport

Customs declaration forms use chemically treated paper

HERE’S THE INTERESTING PART

Those multi-copy forms use pressure-sensitive paper: writing bursts tiny dye capsules on one sheet, and the color marks the sheet below. One pen stroke creates matching customs records without carbon paper—bureaucracy’s quiet copy machine.

One discovery leads to another.

Keep exploring facts in this topic.

Transport →
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
ONE MORE DISCOVERY?

Keep exploring

All in this topic →
Travel visas occupy entire pages of your booklet
Transport

Travel visas occupy entire pages of your booklet

A visa needs room for its dates, entry conditions, stamps, and security markings, so it often takes a full page instead of a tiny ink stamp. Crossing a border…

Discover more
Airport slots gave airlines a reason to preserve a timetable.
Transport

Airport slots gave airlines a reason to preserve a timetable.

Airport slots gave airlines a reason to preserve a timetable. At congested airports, failing to use enough allocated slots can cost an airline its future…

Discover more
Filling potholes with temporary asphalt patches is a Sisyphean bureaucratic ritual that structurally guarantees the road will crumble again in a few months.
Transport

Filling potholes with temporary asphalt patches is a Sisyphean bureaucratic ritual that structurally guarantees the road will crumble again in a few months.

Filling potholes with temporary asphalt patches is a Sisyphean bureaucratic ritual that structurally guarantees the road will crumble again in a few months. A…

Discover more
Nunavut brought back its bear-shaped license plates in 2025.
Transport

Nunavut brought back its bear-shaped license plates in 2025.

Nunavut brought back its bear-shaped license plates in 2025. The territory announced the return of the distinctive outline after years of public feedback. The…

Discover more
A swimmer paid 36 cents to pass through the Panama Canal.
Transport

A swimmer paid 36 cents to pass through the Panama Canal.

A swimmer paid 36 cents to pass through the Panama Canal. Travel writer Richard Halliburton completed the canal swim in 1928 and paid a toll for the passage.…

Discover more
Passports expand physically when extra pages are added
Transport

Passports expand physically when extra pages are added

When extra pages are added, the passport grows thicker because every new sheet has to fit inside the same bound booklet. The result is a tiny travel document…

Discover more
StackyMore discoveries in the app
Download on the App Store