LK99

Have you ever wondered what happens when someone hits the big red emergency button on an MRI machine? A single unplanned quench costs at least $80,000 in repairs — and once lost scan revenue is counted, the total can pass $1 million. That is not a guess. It comes from ECRI, the independent patient-safety organization, which documented a health system whose MRI quenched twice in six months. The repair bill alone started at $80,000 each time, and the scanner stayed dark for up to two months. So why does one button press cost so much? The answer comes down to four line items — and the biggest one is a gas that escapes into the sky the moment the magnet quenches. The Short Answer: Two Bills, Not One Think of a quench as two separate bills: the repair bill and the empty-schedule bill. The repair bill covers helium, labor, and parts. The empty-schedule bill covers every scan that could not happen while the machine sat idle. Most headlines quote only the first number. The second one is ...

Have you ever wondered what happens when a magnet carrying thousands of amps suddenly loses the one property that makes it work? A quench is the moment a superconducting magnet turns resistive — and the energy it was storing has nowhere to go but out, as heat, in seconds. What a Quench Actually Is A quench is a runaway chain reaction that starts with a spot of wire no bigger than a grain of sand. A superconducting magnet only works while its wire stays below a critical temperature. Warm one tiny section above that line, and that section becomes an ordinary resistor. That is where the trouble starts. The magnet is still carrying thousands of amps, and current flowing through a resistor makes heat — the familiar I²R heating of any electric heater. The heat warms the wire next door, which also turns resistive, which makes more heat. The normal zone races along the coil at 15 to 20 metres per second, and within a fraction of a second the whole magnet has quenched. The trigger c...

Could you build a magnet 200,000 times stronger than Earth's magnetic field — in a factory? Yes, but not by machining metal. A superconducting magnet is wound like a spool of thread, baked in an oven at 650 °C, glued solid with epoxy, frozen to −269 °C — and only then switched on. The result is a magnet that carries thousands of amps with zero resistance and holds its field for years without a power supply. Here is the process, step by step, from a spool of wire to the 11.3-tesla quadrupole magnets now being installed at CERN. 1. The Wire: Thousands of Hair-Thin Filaments in Copper The whole magnet starts as wire thinner than a human hair — thousands of superconducting filaments buried in solid copper. A single strand of magnet wire is not one solid wire. It is a bundle of superconducting filaments, each about 20 micrometres across — roughly a fifth of a human hair — embedded in a copper matrix. The copper is not decoration. It gives the wire mechanical strength, and it is th...

Why would a ceramic — the stuff of coffee mugs — carry electricity better than any metal on Earth? Because inside a cuprate, paper-thin sheets of copper and oxygen do something no ordinary material can: below a critical temperature, they let current flow with exactly zero resistance. Cuprates are the highest-temperature superconductors known at normal pressure. In March 2026, a team at the University of Houston pushed the record to 151 K — that is −122 °C, or −188 °F — without any crushing pressure at all. And after forty years of research, physicists still do not agree on why they work. Here is the plain-language version: what a cuprate is, how doping turns an insulator into a superconductor, which families hold the records, and where the material is already doing real work. A Ceramic Sandwich: Copper-Oxide Planes and Spacer Layers The whole trick is the layering: superconductivity lives in flat copper-oxide sheets, and everything else in the crystal just holds those sheets apart...

Why did a grey lump of ceramic fool physicists around the world for six weeks in the summer of 2023? Two ordinary effects, happening at the same time, produced both signatures of a superconductor — and neither one was superconductivity. LK-99 is a copper-doped lead apatite, roughly Pb9Cu(PO4)6O. On 22 July 2023, Sukbae Lee, Ji-Hoon Kim and colleagues posted two preprints on arXiv claiming it superconducted at up to 400 K — 127 °C, hotter than boiling water — at ordinary pressure. The claim collapsed within 25 days. But the physics of why it looked so convincing is worth understanding, because the same two traps will be waiting in the next claim. For the full timeline of what happened, see our earlier explainer: What Is LK-99? The Room-Temperature Superconductor Claim, Explained . The Two Tests Every Superconductor Must Pass A material earns the name only by passing both tests in the same sample, at the same temperature. The first test is zero resistance . Below its critical temper...

Have you ever wondered why the name of this blog keeps showing up in searches for a "room-temperature superconductor"? LK-99 is not a superconductor. It is a copper-doped lead compound that a Korean research team claimed in July 2023 could carry electricity with zero resistance at room temperature — and within 25 days, independent labs showed the claim was wrong. This is the full story, the numbers behind the verdict, and where the real search stands in 2026. What LK-99 Is — and What Was Claimed LK-99 is a copper-doped lead oxyapatite, roughly Pb9Cu(PO4)6O. The name comes from the initials of Sukbae Lee and Ji-Hoon Kim, the Korea University researchers who led the work, and 99 for 1999, the year they began studying the material. On 22 July 2023, the team posted two preprints on arXiv claiming LK-99 was "the first room-temperature ambient-pressure superconductor," with a critical temperature up to 400 K — that is 127 °C, hotter than boiling water — at ordinary p...

Have you ever stepped outside on a clear night, looked up, and wondered where to even begin? Tonight is the best night of the month to find out. The Moon is new, the sky is at its darkest, and with no telescope at all you can see about 2,000 stars, four planets, and a galaxy 2.5 million light-years away. This is a timed plan for your first night out: what to look at, in what order, and what each step actually adds. No equipment to buy first — just a clear evening, 20 minutes of patience, and a willingness to look up. What Your Eyes Can See Tonight — the Numbers From a dark site, your unaided eyes can pick out roughly 2,000 to 2,500 stars at once. Across the whole sky there are about 9,000 stars brighter than magnitude 6.5, the usual naked-eye limit. You only ever see half the sky at a time, and haze near the horizon hides more, so the practical count on any given night is around 2,000. That number collapses fast under city lights. The Bortle scale, published in Sky & Telescop...