When did people arrive in the Americas? New evidence stokes debate. New evidence may push back the date on human arrival to the Americas, and an examination of science’s flaws.

In this episode:

00:59 Ancient Americans

Two papers suggest that humans were present in the Americas thousands of years before many people have thought. We examine the evidence. Research Article: Ardelean et al.; Research Article: Becerra-Valdivia and Higham; News and Views: Evidence grows that peopling of the Americas began more than 20,000 years ago

10:44 Coronapod

We discuss the latest results from vaccine trials around the world, and controversy in the US as COVID-19 data collection moves out of the CDC. News: Coronavirus vaccines leap through safety trials — but which will work is anybody’s guess

24:38 Research Highlights

How being green makes things easy for some frogs, and how waves will be affected by climate change. Research Highlight: How frogs became green — again, and again, and again; Research Highlight: Extreme Arctic waves set to hit new heights

27:11 How can science improve?

A new book highlights some of the flaws of how science is done. We caught up with the author to find out his thoughts on how science can be cleaned up. Books and Arts: Fraud, bias, negligence and hype in the lab — a rogues’ gallery

35:54 Briefing Chat

We take a look at some highlights from the Nature Briefing. This time we discuss a puzzling new insight into the expansion of the Universe, and an update to Plan S that will allow open-access research to be published in any journal. Nature News: Mystery over Universe’s expansion deepens with fresh data; Nature News: Open-access Plan S to allow publishing in any journal