THRIVING after the FALL
Book One FEASTING after the FALL

The Log · FEASTING · Read the chapter

Preface: Setting the Table

3 claims

P1 amended 00 Preface, opening

Table salt in a Berlin shop comes from a mine near Bernburg on the Saale

To check against
esco / K+S plant list (Bernburg is a K+S salt works); check that retail salt in Berlin is plausibly from there or generalise to "a mine in Saxony-Anhalt"
The verdict
AMENDED
Found
kpluss.com/en-us/about-ks/sites/europe/bernburg/ ; esco-salt.com/bernburg.html
Note
Bernburg (Saale) is confirmed as a major K+S/esco salt works producing food-grade and table salt (99% NaCl), so the mine exists and makes retail-grade salt. But no source found confirming that a specific Berlin shop's salt is traceable to Bernburg rather than the more common Bad Reichenhall/Süddeutsche Salzwerke brands sold in Berlin supermarkets. Propose the brief's own fallback: "a mine in Saxony-Anhalt" or "a mine near Bernburg, on the Saale" without asserting the specific shop-to-mine chain.
P2 confirmed 00 Preface, The good news

Iron smelted from bog ore in clay furnaces in the Brandenburg woods

To check against
Archaeology of Raseneisenerz smelting in Brandenburg (Slavic and medieval bloomeries, e.g. Glienick, Spreewald); a museum or Landesarchäologie source
The verdict
CONFIRMED
Found
academia.edu/80628125/The_Teltow_an_Early_Iron_Smelting_D… (Glienick-type bloomeries, Teltow/Brandenburg, bog iron/Raseneisenerz smelted in clay-walled bloomery furnaces)
Note
Matches the "Glienick" example named in the check-against column. The best-documented Brandenburg bog-iron smelting is pre-Roman Iron Age (Jastorf culture) rather than exclusively "Slavic and medieval," though Slavic-period bloomeries are also attested regionally; wording is fine as a general claim about the practice occurring in Brandenburg's woods.
P3 amended 00 Preface, What it takes

"300 people ... the number a human being can know by name"

To check against
Dunbar 1992/1993 (150) and the 500 tier; soften wording if needed
The verdict
AMENDED
Found
en.wikipedia.org/wiki/Dunbar%27s_number (citing Dunbar 1992/1993)
Note
Dunbar's number for stable, meaningful relationships is 150, not 300; the tier for people one can "recognise and put a name to" is about 500. "300" matches neither tier. Proposed: "150 — Dunbar's number, the tier of people we can hold a stable relationship with" (or, if the sense wanted is name-recognition, "500, the number Dunbar's research suggests we can know by name").