There are 15 possible ways to cover a floor with pentagonal tiles

Who would have guessed tiling is so complex?

Finally, a new pentagon shape that tiles in a plane

Both bathroom decorators and mathematicians have a reason to rejoice (how often does that happen?). Using a computer algorithm, a group of mathematicians at the University of Washington Bothell discovered the 15th kind of pentagon that can tile in a plane. The 14th was discovered in 1985 by mathematician Rolf Stein, while the previous five before were proven by Majorie Rice, a housewife from San Diego.

“Climate change is a security risk,” Pentagon report reads

On Wednesday, the Department of Defense issued a report in which it highlights the global security implications of climate change. In the report, the authors note that climate change will exacerbate current world problems like ” poverty, social tensions, environmental degradation, ineffectual leadership and weak political institutions that threaten stability in a number of countries.”

The Pentagon’s High Stakes Video Game

What if real war were as simple as killing bad guys in a video game? Children have played at war since the days of antiquity.  Nowadays, however, technologies have emerged to obliterate the lines between child’s play and real war.  The Virtual Battlespace Systems (VBS) that the United States Marine Corps (USMC) uses to train recruits borrow heavily from video

New Pentagon Tech: sky drones that identify faces

I’d like to divert from a potential discussion which might build around the trillions of dollars spent on defense by the US government or the more or less futile efforts enterprised in the middle east, and stick to the point at hand – spy drones! Yes, scary, paranoia inducing flying unmanned vehicles whose sole purpose is that of collecting intelligence about its