Assertion: fuel | /r/ObjectUse | used by human
Facets:
Source sentences:
text: Wood is one of the first fuels used by humans
text: Perhaps the earliest fuel employed by humans is wood.
text: Hydrocarbons and related oxygen-containing molecules are by far the most common source of fuel used by humans, but other substances, including radioactive metals, are also utilized.
text: Throughout most of human history only fuels derived from plants or animal fat were used by humans.