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Seriously? You care enough about temporal accuracy buy an atomic clock but you don't know how to build one? We won't tell.Thankfully DIY Physics has a great tutorial on how to build your own with parts from eBay.

"On Saturday, around 18 months after President Obama signed it into law, the Leahy-Smith America Invents Act will take effect. Ostensibly, the act is designed to bring U.S. patent law in line with the rest of the world. Of course, not everybody feels it will help achieve the patent system's goal of protecting inventors while fostering innovation, and its effect could be even more pronounced on the DIY inventor."

Inside NYU art professor David Darts' black metal lunchbox, painted with a white skull and crossbones, is the PirateBox - a tiny Linux server, a wireless router, and a battery. Turn the PirateBox on and you have a self-contained mobile communications and file-sharing device, whereby those in the vicinity can upload and download files securely and anonymously. (See this 2011 Ars Technica story for photos and details.) Built with free and open source software and openly licensed itself, the PirateBox has inspired a number of other projects, including Alan Levine's Storybox and now Jason Griffey's LibraryBox.

One of the most beautiful aspects of science is that while there is so much we can see and smell and feel around us, there's an inconceivably large universe around us full of things we can't directly observe. The Tricorder project aims to develop handheld devices that can sense a diverse array of phenomena that we can't normally see, and intuitively visualize them so we might see temperature or magnetism or pressure as naturally as we see colour. 

As a child, I always looked up at the stars and wondered how I could make it into space. Hopefully, I will live to see that day, but for now, a homemade satellite will have to do. The Nanosatisfi team has made it their mission "to provide affordable space exploration for everyone!," and with ArduSat, they move one step closer to reality. ArduSat is a Arduino-controlled miniature 10cm cubic satellite, weighing 1 kg, which is roughly equivalent to half a store bought loaf of bread. Its size might not be impressive, but it packs over 25 sensors including: Myspectral's open source spectrometer, inertial measurement unit, magnetometer, along the standard set, and many others. This impressive little machine boasts a camera to take photographs, it could send messages back to earth, or it can run your space experiments. With the ability to upload code directly to the ArduSat while in space, the possibilities are virtually limitless.

The Cryoscope shows the user exactly what to expect outside by haptically exhibiting exactly how cold or warm it is to be outside. The user simply touches an aluminum cube that has been heated or cooled to the appropriate temperature. The unit fetches weather data from the internet, and translates it to the cube physically, pumping heat in or out of the cube.