These footprints confirm that humans were in North America several millenia earlier than previously

[PoindexterOglethorpe]

1. I recall reading several decades ago,

some anthropologist complaining that they were essentially forbidden to dig below the Clovis layer, because everyone knew Native Americans only got here 13,000 years ago, so finding early indications was simply not done.

For one thing, if Native Americans only get here that recently, they'd have been hard pressed to make their it all the way to the tip of South America. The many different cultures, tribes, groups, languages, all indicate humans first got here a very long time ago.