Meet 1I/2017 U1 (‘Oumuamua), but make it fast, because it’s already leaving.
Source: First-known interstellar visitor is a bizarre, cigar-shaped asteroid
This is one of the most exciting news stories of the year. We've now actually seen an object that had to have come from another solar system, pass through ours. Data collection by the Hubble telescope continues into December, after which point it's too faint for anything to see again.
For decades, students were taught that the first people in the Americas were a group called the Clovis who walked over the Bering land bridge about 13,500 years ago. They arrived (so the narrative goes) via an ice-free corridor between glaciers in North America. But evidence has been piling up since the 1980s of human campsites in North and South America that date back much earlier than 13,500 years. At sites ranging from Oregon in the US to Monte Verde in Chile, evidence of human habitation goes back as far as 18,000 years.
Source: Most scientists now reject the idea that the first Americans came by land | Ars Technica
Pretty huge change in what we were taught growing up, and a great story about how extraordinary claims require extraordinary evidence. And when that evidence is compelling, scientific consensus moves. This also provides more overlap for the mega fauna die off and human habitation, which makes sense.
Exploring and discovering how things are more complicated, with a focus on climate and software