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==Basic concepts== | ==Basic concepts== | ||
===Humus=== | |||
"It is difficult to define humus precisely because it is a very complex substance which is not fully understood." | |||
https://en.wikipedia.org/wiki/Humus | |||
===Life=== | ===Life=== | ||
"There are over a 100 definitions for 'life' and all are wrong" <br> | "There are over a 100 definitions for 'life' and all are wrong" <br> | ||