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# Hardcore Science

2026-11-06

Time-Traveler's Guide: Why Ancient Swords Took 100 Foldings—And How to Turn Stinky Coal into Metallurgical Coke and Crucible Steel in One Melt

Time-Travel Core Tech Reconstruction Series #10. In the pre-industrial world, cast iron (>2.5% carbon) was too brittle for swords or cannons, while wrought iron (<0.05% carbon) bent on impact. Worse, smelting with raw coal introduced sulfur, causing catastrophic 'hot shortness.' Here is how to build a beehive coking oven and a Huntsman-style kaolin-graphite crucible furnace to pour homogeneous 0.8% high-carbon steel.

2026-11-02

Time-Traveler's Guide: Making Penicillin from Moldy Oranges Will Kill You—How to Extract Willow Salicin and Allicin Instead

Web novels love the trope of brewing penicillin from moldy oranges in ancient times. In reality, that produces lethal mycotoxins and anaphylactic shock. Here is the real biochemistry and step-by-step extraction of Allicin, Willow Bark Salicin, and Berberine.

2026-11-01

Time Traveler's Guide: When Drinking Raw Water in Ancient Times Could Kill You, How to Build a Charcoal-Alum Filter and Life-Saving ORS

[Time Traveler's Core Tech Reconstruction · Episode 05] If a modern person woke up in pre-industrial history, the deadliest threat in the first 72 hours wouldn't be swords or bandits—it would be acute dysentery or cholera dehydration from a single sip of river or well water. Grounded in colloid chemistry, slow-sand filtration, and intestinal SGLT1 sodium-glucose cotransport physiology, here is how to build a 3-layer alum-charcoal water purifier and mix Oral Rehydration Salts (ORS) using coarse salt and maltose.