Assertion: rattlesnake's rattle | /r/MadeOf | same stuff
Facets:
Source sentences:
text: A rattlesnake’s rattle is made of the same stuff that makes human hair and fingernails.
text: Their rattle looks like stacked rings and is made of the same thing your fingernails are made of.
text: Rattlesnakes have either a rattle or a partial rattle made of interlocking rings, or segments of keratin, the same material our fingernails are made of.