If, like me, you are starting to embrace social networking and the networked economy, you now have networks in your email address book, on LinkedIn, Ecademy and elsewhere. Given that these networks all overlap, you are beginning to get frustrated that you need to manage each of them separately. Here’s a new tool that eases a good chunk of that frustration.

The Christmas Day bomber, Umar Farouk Abdulmutallab, has been indicted by a US grand jury on a charge of “attempted use of a weapon of mass destruction”. Yes, that’s right, a pair of loaded underpants is now officially a WMD.

Risk is often the most important element to consider in a big decision. It is certainly the area that causes the most anxiety. But a lot of people and organisations have problems dealing with it, and usually this starts with the way they communicate.

Inside a windowless room is a light that is off. There are three switches outside, only one of which turns the light on/off. You are outside the room and allowed to play with the switches but not to look into the room in the process. You are allowed to go into the room once, after which you must directly say which switch works the light?

Looking at a usual analogue clock, how many times does the minute hand pass the hour hand between midday and midnight?