Charles Darwin's book The Formation of Vegetable Mould through the Action of Worms (1881) presented the first scientific analysis of earthworms' contributions to soil fertility. Some burrow while others live entirely on the surface, generally in moist leaf litter. The burrowers loosen the soil so that oxygen and water can penetrate it, and both surface and burrowing worms help to produce soil by mixing organic and mineral matter, by accelerating the decomposition of organic matter and thus making it more quickly available to other organisms, and by concentrating minerals and converting them to forms that plants can use more easily. Earthworms are also important prey for birds ranging in size from robins to storks, and for mammals ranging from shrews to badgers, and in some cases conserving earthworms may be essential for conserving endangered birds.
What was the first scientific study of how earthworms help soil?
The Formation of Vegetable Mould through the Action of Worms

The old oracles in Delphi seem to be connected with a local tradition of the priesthood, and there is not clear evidence that a kind of inspiration-prophecy existed in the temple. This led some scholars to the conclusion that Pythia carried on the rituals in a consistent procedure through many centuries, according to the local tradition. In that regard, the mythical seeress Sibyl of Anatolian origin, with her ecstatic art, looks unrelated to the oracle itself. However, the Greek tradition is referring to the existence of vapours and chewing of laurel-leaves, which seem to be confirmed by recent studies.
What Greek tradition seems to be confirmed by recent studies?
existence of vapours and chewing of laurel-leaves

The Siddi are an ethnic group inhabiting India and Pakistan whose members are descended from Bantu peoples from Southeast Africa that were brought to the Indian subcontinent as slaves by Arab and Portuguese merchants. Although it is commonly believed locally that "Siddi" derives from a word meaning "black", the term is actually derived from "Sayyid", the title borne by the captains of the Arab vessels that first brought Siddi settlers to the area. In the Makran strip of the Sindh and Balochistan provinces in southwestern Pakistan, these Bantu descendants are known as the Makrani. There was a brief "Black Power" movement in Sindh in the 1960s and many Siddi are proud of and celebrate their African ancestry.
Who did the Siddi descend from?
Bantu peoples from Southeast Africa