The 14

Silicon, element 14 — the mind of every machine ChemistryComputing

Silicon sits at atomic number 14, and after oxygen it is the most abundant element in the Earth's crust — better than a quarter of the ground by weight, most of it locked up as the silica of ordinary sand. That same element, purified to a flawlessness almost beyond imagining (fewer than one stray atom in a billion), is the semiconductor that every computer chip is carved from. Its four outer electrons let it be coaxed to conduct or to block electricity on command, and that switch, repeated billions of times on a fingernail of crystal, is the physical substance of all modern computing.

The whole industry is named for it — Silicon Valley — and the shift from vacuum tubes to element 14 is arguably the technological hinge of the last century. Silicon also builds the inanimate world: quartz, glass, sand and most rock are silicon-and-oxygen. One element, number 14, makes both the beach and the brain that reads this.

Carbon-14 — the clock inside everything once alive ChemistryPhysics

High in the atmosphere, cosmic rays knock neutrons into nitrogen-14 and turn it into carbon-14 — a rare, radioactive form of carbon with two extra neutrons. Living things breathe and eat it in a fixed trace along with ordinary carbon, so every plant and animal carries the same small proportion of 14C while it lives. At death the intake stops and the carbon-14 begins to decay, halving every 5,730 years like a ticking clock sealed inside the remains.

Measure how much 14C is left and you can read off how long ago the thing died — radiocarbon dating, worked out by Willard Libby in 1949 and worth a Nobel Prize. It is how we date the Dead Sea Scrolls, Ötzi the iceman, and cave paintings tens of thousands of years old. Element 6's rarest isotope, mass 14, is the reason the deep human past has a calendar at all.

The fourteen Bravais lattices — every crystal there can be MathematicsPhysics

Ask how many fundamentally different ways points can be stacked in a repeating three-dimensional grid — the skeleton on which every crystal is built — and the answer is a hard, finite number: exactly 14. These are the Bravais lattices, named for Auguste Bravais, who completed the count in 1848. Every mineral, metal and snowflake, every salt and semiconductor, arranges its atoms on one of just these 14 frameworks — simple, body-centred or face-centred cells sorted into seven crystal systems.

It is a striking piece of mathematics made physical: nature has infinitely many substances but only 14 ways to tile space periodically with a lattice of points. The rock, the diamond and the chip all have to choose from the same short list of 14.

The many quiet fourteens of number Mathematics

14 is a small hub where several famous sequences pass through. It is a Catalan number — the fourth, after 1, 2, 5 — which means, among a hundred other things, that there are exactly 14 ways to cut a hexagon into triangles with straight diagonals, and 14 different shapes of branching tree with four leaves. It is a square pyramidal number: stack cannonballs in a pyramid on a 3×3 base and you use precisely 14 of them (1 + 4 + 9). And it is the product of the first two ‘calendar primes’ of this record, 2 × 7, which is why it keeps turning up wherever a week is doubled.

The body's fourteens — the hand and the face Life

Two textbook counts in human anatomy land on 14. Each hand has exactly 14 phalanges — finger bones — three in each finger and two in the thumb, so the fourteen little joints of one hand do most of the work of grasping and gesturing. And the human face is framed by 14 facial bones: the paired cheekbones, nasal bones, jaw and palate bones that, with the single vomer and mandible, make up the skeleton of the face beneath the skin. Hand and face — the two most expressive parts of the body — are each built on the number 14.

The fortnight — fourteen nights and the full moon CosmosCulture

A fortnight is fourteen nights — the word is a worn-down “fourteen-night” from Old English, still the everyday unit of time across much of the English-speaking world. It is no accident that it is half a lunar month: the Moon takes about 14.8 days to go from new to full, so 14 nights is very nearly the span of the waxing moon. Twice a month, at new moon and full, the Sun and Moon pull in line and the tides swell to their highest “spring” range — a roughly fourteen-day rhythm written into every coastline. Fourteen is the number that halves the moon's month, and the sea keeps time to it.