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Charles Darwin’s cross-section of soil: fine mould laid down by earthworms over stones and a buried floor.

Soil

Backend & Databases

APIs, servers, logins and databases: the part of an app you never see.

Still growing · 12 notes planned

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Notes by Nilanchal Jena, written from first principles for beginners.

Bedrock: Thomas Webster, engraved by J. Fisher. Wellcome Collection, CC BY 4.0
Rainforest: Ernst Haeckel, Kunstformen der Natur, 1904. Public domain
Mycelium: Ernst Haeckel, Kunstformen der Natur, 1904. Public domain
Meadow: Homer D. House, Wild Flowers of New York, 1918. Public domain
Soil: Charles Darwin, The Formation of Vegetable Mould, 1881. Public domain
Beehive: Engraving by H. Summons. Wellcome Collection, CC BY 4.0
Fireflies: Charles Frederick Holder, Living Lights, 1887. Public domain