Most of the complex spatial and temporal relationships of periodical cicada broods and species must be less than 10,000 years old, because much of the current range of periodical cicadas in the eastern, Appalachian, and Midwestern U.S. would have been unsuitable for periodical cicadas during and for substantial periods following the Wisconsin ...
Just be sure not to serve her any Jell-O in the near future or your next class speaker may be a representative from PETA. Glue, historically, is indeed made from collagen taken from animal parts, particularly horse hooves and bones. In fact, the word âcollagenâ comes from the Greek kolla, glue.
Itâs also the key ingredient in most animal glues, as it can be made into a gelatin thatâs sticky when wet but hardens when it dries. The word collagen actually derives from the Greek kolla, meaning glue, and the suffix -gen, meaning producer. As large, muscled animals, horses contain lots of this glue producer. Horse glue isnât generally better or stickier than any other kind of animal glueâindeed, an elephant could be used to make even more glue than a horseâand animal glue is more often made from pigs and cattle.