Cities are useful because of connectivity. We maximize population density to maximize the benefits of this connectivity. (Of course, it also drives city dwellers mad, but that’s another story.)
The use of the third dimension is for now limited by elevator technology: As skyscrapers get taller you lose more and more space for more and more elevator shafts.
Continue reading “Future Cities: 3D Elevators”
We’re always looking for new and exciting ways to defy gravity. Magnus effect airplanes are actually pretty old, tried out in the 1940ies, and like the Quadcopter which was first tried out in the 1920ies, abandoned at the time due to the control problems.
Continue reading “Science: Magnus Effect Airplane”
Too funny. 550 tons payload to LEO. Dirt cheap price per kg: 60 to 600 bucks. Space Shuttle was 15,000.
Cost projection validated by NASA. The stupidity.
Situational awareness is key. Two incidents: Two North Africans threw a guy on the tracks, then prevented him from getting back up. Operator of incoming train managed to stop in time, a few meters from the victim; then German state attorneys RELEASED THE PERPS the same day.
Continue reading “Keep Your Eyes Open On German Rail Stations”