Unlike most helicopters, hovering drones use multiple rotors. Many drones are based on a design called a quadcopter, which employs four rotors on arms set 90 degrees to each other. Each rotor is directly driven by an electric motor. By turning two of the rotors clockwise and two anticlockwise it counters the twisting effects of […]
The Economist magazine published an article titled ‘What Paris’s night of horror means for Europe’ which contained the following graph: Ever since a commando-style raid by a jihadist group in Mumbai eight years ago that killed 166 people and lasted for four days, there have been fairly regular instances of similar plots either being uncovered […]
The Economist magazine has an article and interactive chart of housing in America. From the article: FIVE years after the house price crash that nearly took down an entire financial system, America’s property market appears to be in rude health: prices have appreciated by 17% over the past three years. But that statistic hides vast […]
The UN convention banning the manufacture, use and stockpiling of cluster munitions, which came into force last year, has been signed by 108 countries and ratified by 60 of them. But 17 of the non-signatories continue to produce the weapons (see map below), and two have used them in conflict this year: Thailand during border clashes […]
My favorite magazine is The Economist. It has published its annual outlook for the new year. To read about the world in 2012 click here.