A Visual Representation Of How Much Larger A Billion Is Than A Million.⠀ Via U/adriantwo On Reddit

Dvdp aka Davidope

Thousand-year-old Viking fortress reveals a technologically advanced society

When archaeologists uncovered four ancient ring-shaped fortresses in Denmark in the 1930s, the find profoundly changed the way they thought about the Vikings that built them. Rather than mindless marauders, Vikings in the Middle Ages must have been a complex, technologically advanced people to build these fortifications. Now, Danish archaeologists have described a fifth ring fortress—the first such discovery in more than 60 years—revealing even more about these architecturally gifted warriors.

The new fortress, called Borgring, was found principally using an aerial, laser-based surveillance method called LIDAR, which returns an extremely high-resolution 3D ground map. It’s located on the Danish island Zealand, south of Copenhagen. The stronghold is a perfect circle with an outer diameter of 144 meters, and has four main gates crisscrossed by wood-paved roads. Read more.

The solar eclipse of August 30, 1905, observed by the space watchers of the British Astronomical Association.

Japanese archery, Kyudo 弓道

Engineered robot interacts with live fish

via kurzweilai:

A bioinspired robot has provided the first experimental evidence that live zebrafish can be influenced by engineered robots — a step toward using autonomous robots in an open environment to protect endangered animals and control pest species. […]

[read more @kurzweilai & @iop] [paper] [image credit: G Polverino et al./Bioinspiration & Biomimetics]