A curated version of Darwin's last publication... and best seller (more than the Origin of Species).
The full title of his opus published in 1881 was:
The Formation of Vegetable Mould, through the Action of Worms,with Observations on their Habits.
The book includes summaries, the modernised versions of Darwin's original, the validation of his results by the most recent research and suggested YouTube references to each chapter's topic.
Spoiler alert: yes, he was right. Surprinsingly right.