Blog · 3 articles

The history of units
and what they mean.

Where the units we use come from. Why they have the values they do.

FeaturedLength

The history of the meter — from a meridian to the speed of light

A quarter of a million local measures, six years of expedition across a country at war, a hidden error that haunted an astronomer to his death — and a unit that today depends on no physical object at all. This is how humanity measured the world.

Apr 12, 2026 · 13 min read
A glowing emerald meridian arc with a triangulation grid over the outline of France, against a cosmic nebula in violet and magenta
VolumeSoon

US vs UK gallon — why they differ

Two islands, two empires, two gallons differing by almost 20%. Where the discrepancy comes from and why it matters for fuel economy.

5 min
TemperatureSoon

Kelvin, Celsius, Fahrenheit — three scales, one physics

Why scientists use Kelvin, the world uses Celsius, and Americans use Fahrenheit. The zero point of each scale tells a story.

7 min