What was the main problem for the breaker boys and the main solution for that problem.

A breaker boy was a coal-mining worker in the United States and United Kingdom whose job ... coal, iron, and machine developments leading ultimately to railroads and the infant industrial chemicals industries of the 1860s. ... for the even sizes combusted with less trouble and need for tending once past the ignition point

Explanation:

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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