Assertion: fuel cell's 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.
text: The most common type of nuclear fuel used by humans is heavy fissile elements that can be made to undergo nuclear fission chain reactions in a nuclear fission reactor; nuclear fuel can refer to the material or to physical objects (for example fuel bundles composed of fuel rods) composed of the fuel material, perhaps mixed with structural, neutron moderating, or neutron reflecting materials.