api-design
CORS is the browser policy that controls which origins can call your API from JavaScript. Get it wrong in the permissive direction and you create CSRF vulnerabilities; get it wrong in the restrictive direction and customers cannot integrate from browsers at all.
history
The first human flight happened in November 1783, more than a century before powered aircraft. The Montgolfier brothers used paper, linen, and a smoky fire of straw and wool. The wrong theory of why it worked persisted for decades and led to several deaths.
history
The catapult is one of the few major military technologies for which a complete invention date and inventor name are recorded. The first catapults were built around 399 BCE in the workshops of Dionysius I of Syracuse, and the engineering tradition they started ran continuously for 1800 years.
history
The crossbow is one of the rare weapons that successive generations of authority tried to ban while continuing to use. It enabled a peasant to kill an armored knight, which was politically inconvenient even when militarily useful. The mechanics, the politics, and the slow displacement.
history
The sewing needle is one of the oldest continuously-used human tools. It predates pottery by 30,000 years, predates agriculture by 35,000 years, and outlasted every empire that produced it. The 60,000-year arc of needle technology is a study in how foundational tools can be both ancient...
history
Aristotle sketched a diving bell in 330 BCE. The first successful working bell appeared in 1535. The first one a human could survive in for an hour came in 1690. Reliable underwater breathing arrived only in the 20th century, and the gap is mostly about chemistry humans did not understand...
history
The thermometer as a physical device was invented around 1600. The thermometer as a reliable instrument that gave the same reading at different times in different cities did not exist until the late nineteenth century. The three-century gap is mostly the history of standardization.
api-design
Webhook retry policy is one of the highest-leverage design decisions in a B2B API because it determines the contract between your delivery guarantees and your customer's recovery options. The patterns that scale are not the ones most APIs ship with.
history
In 132 CE, Han astronomer Zhang Heng built a bronze vessel with eight dragon heads that dropped a ball when an earthquake occurred, with the dragon indicating the direction. The instrument predated European seismographs by 1800 years. Modern seismology is the slow recovery and extension of a...
history
The helicopter took 500 years from concept to practical flight, longer than almost any other modern aircraft. The reason was not lack of imagination. The reason was that the physics of rotary-wing flight is much harder than the physics of fixed-wing flight, and the engineering had to wait fo...
history
Elevators existed for two thousand years before they reshaped cities. The transformation took a single demonstration of a small mechanical device at the 1853 New York World's Fair.
history
The 1913 discovery in a Sheffield laboratory of an iron alloy that did not rust. The decades of resistance before the kitchen took it seriously. And the metallurgical fact that made it possible.