Survival
Eating Grass: What Processing Can and Cannot Unlock
Humans eat vast quantities of grass — cereal grains are grass seeds — and it's the leaf blade specifically that fails. Cooking does nothing to β(1→4) bonds; drying produces powdered fibre; silage preserves forage without making it human-digestible; juicing yields protein and micronutrients rather than calories; freezing improves extraction of the accessible fraction only. The one route that converts the bulk is growing fungi on it, and in a real survival scenario none of it beats seeds, roots and insects.
Can Humans Digest Grass? The Three Barriers and What Processing Can Reach
Poaceae includes the world's staple calorie crops — it's the leaf blade specifically that fails, on three independent counts: cellulose with no human cellulase, abrasive silica phytoliths, and bulk without digestible energy. What's available is the soluble protein, sugars and vitamins locked inside the cells, so the processing objective is rupturing walls and discarding fibre. The high-calorie routes target seeds and stems; processing the leaf buys protein and micronutrients.
Dr. Stone's Petrification Premise and the Real Science of Caching a Civilization
The manga Dr. Stone imagines all humans petrified for 3,700 years, then revived to rebuild civilization from scratch. The premise maps onto a real engineering problem studied by archivists, seed banks, and nuclear-waste planners: what can you deliberately leave behind that survives millennia and helps survivors restart?
Caching a Civilization Restart Kit: What Actually Survives 3,700 Years
If you had to leave a survival kit and instructions that lasted ~3,700 years for people who had forgotten everything, almost no modern object qualifies. The durable strategy is a tiered cache: stone and ceramic markers, salt-mine storage, and irreplaceable high-multiplier objects like lenses and refined metals.
The Industrial Seed Crystal: What Modern Survivors Would Actually Need to Cache
If survivors keep their modern knowledge, the cache problem inverts: you no longer need an instruction manual, you need the physical bottlenecks that take centuries to recreate by hand. Priority order is the electricity loop, machine tools, refined raw materials, finished semiconductors, and dating instruments.