Comet, Meteor or Alien Spacecraft

Since its first sighting in 2017, “Oumuamua” has puzzled scientists and researchers. Its strange propulsion-like movement and determined trajectory call into question whether the long, flat object is merely a comet or a meteorite—despite that being the more mundane, and maybe likely, conclusion. The way the object sped up as it passed the sun has researchers most puzzled. “Lightsails,” the solar-powered starships that Breakthrough Starshot plans …

Artsy’s Favorite Free Online Courses

While you may not receive academic credit for them, there’s an abundance of free college courses available online. From a class called Pyramids of Giza: Ancient Egyptian Art to Archaeology at Harvard University or Antiquities Trafficking and Art Crime at the University of Glasgow, there are around 10,000 online courses offered by 800 universities. Each one varies in length (from a few weeks to seven months) but …

Newfound Evidence Changes Chocolate’s History

The origins of chocolate, at least until last week, dated back about 3,500 years ago to civilizations in Mexico and Central America. But now, thanks to newfound evidence, cacao’s history actually begins 1,500 years earlier in South America. Tests run on the bowls, mortars and jars found in the highlands of Ecuador—in the area known as Santa Ana-La Florida—proved traces of cacao remained. This confirms a …