Bio char has more facets than pure carbon - our heads our swimming after unloading our first large batch of bio char.
Bio char is charcoal produced in a environmentally sound manner that is optimized to be used as a soil amendment.
On of the primary bio-assays, or field tests for quality, is to plop some worms between two piles of soil: one with char and one without. Come back and see which one they all migrated to.
Farmer Willy shows us empirical truth that his worms like our char... find the worm eggs!