Assertion: fuel cell | /r/CapableOf | trace its roots
Facets:
value: back to the 1800s
type: TEMPORAL
Source sentences:
text: The fuel cell can trace its roots back to the 1800s when a Welsh-born, Oxford-educated barrister, Sir William Robert Grove, realized that if electrolysis, using electricity, could split water into hydrogen and oxygen, then the opposite would also be true.