Assertion: light | /r/HasProperty | a kind of wave
Facets:
Source sentences:
text: Two early ideas come from the 17th century: English scientist Isaac Newton thought light was made of little particles (he called them corpuscles) emitted by hot objects (such as the sun or fire), while his contemporary, the Dutch physicist Christiaan Huygens, thought light was a kind of wave vibrating up and down as it moved forward.