biology
The narwhal tusk is one of the strangest structures in mammalian biology. It is a tooth that grows nine feet through the upper lip of the male narwhal, spiraled like a unicorn horn, with ten million nerve endings exposed to the seawater. After a century of competing hypotheses, the working theory...
history
For 1,800 years the astrolabe was the most sophisticated portable computing device in human civilization. It told time, determined latitude, calculated the start of Ramadan, surveyed land, and predicted star positions. Then in two centuries it disappeared so completely that the craft of making on...
biology
Honey bee colonies maintain the brood nest at 34-36 degrees Celsius across ambient temperatures ranging from below freezing to over 40 degrees. The mechanism is one of the cleanest cases of distributed engineering in the natural world, with no central controller and no individual bee aware of the...
history
Before 1840, the recipient paid the postage on a letter, and the rate was calculated by distance and number of sheets. Rowland Hill argued the system was broken and the fix was a flat low rate paid by the sender via an adhesive stamp. Almost everything about modern communication descended from th...
essay
The schoolroom version of the steam engine credits James Watt as the inventor. The actual history runs through Thomas Newcomen's 1712 atmospheric engine, which operated commercially for sixty years before Watt improved it, and through Hero of Alexandria's working steam toy 1700 years earlier.
essay
The trapdoor spider builds a silk-lined burrow with a hinged camouflaged door, sits at the entrance for decades, and ambushes any insect that walks past. The longevity, sensory engineering, and life history of these spiders are stranger than the schoolroom version suggests.
essay
The 1839 Charles Goodyear discovery of vulcanization is one of the rare cases in industrial chemistry where a genuinely accidental observation transformed a useless material into the foundation of a global industry within a generation.
essay
The greater honeyguide bird (Indicator indicator) of sub-Saharan Africa flies to a human, makes a distinctive call, and leads the human to a wild beehive. The mutualism between bird and human is one of the very few well-documented cooperative relationships between humans and a non-domesticated sp...
biology
Watch a cuttlefish hunt a crab and you see something that looks like a magic trick. The cuttlefish hovers, its skin erupts in bands of light and dark that propagate across its body in rapid waves, and the crab freezes. A moment later the cuttlefish strikes with tentacles too fast for the crab to ...
history
Every modern map traces its lineage back to a brass-and-glass instrument that most people have never heard of. The theodolite, invented in the 1570s and refined for four centuries, is the device that converted the world from approximate to precisely-measured at a scale that nation-states required...
history
The Reverend William Lee invented the stocking frame in Calverton in 1589, two centuries before the Industrial Revolution. Queen Elizabeth refused his patent, allegedly because the machine would put hand-knitters out of work. The machine survived anyway, and its descendants still make most of the...
science
Scincus scincus is a 20-centimeter lizard that lives in the dunes of the Sahara and the Arabian Peninsula. When threatened, it dives into loose sand and disappears, then propagates through the sand at remarkable speeds with no limbs visible. The biomechanics of how the lizard moves through a subs...