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.
Yep: that's the stuff that makes Jell-O set and Gummy bears chewy. And it makes damn good glue, too. But it's not that horse glue is actually better than any other animal glue; it's just that historically horses were plentiful, so it made sense to use them. You should definitely read the Slate pirce though â it makes for great reading. [ Slate; Image: Moyan Brenn ].