Google launches Nexus 7 tablet.

Nexus 7.

Google took the wraps off the first device to run Android 4.1, Jelly Bean: a 7-inch tablet made by Asus, called the Nexus 7.

How to build hydroelectric power at home.

A diagram of the Kelvin water dropper.

The Kelvin water dropper, invented by Lord Kelvin (1867), is a type of electrostatic generator. Kelvin referred to the device as his water-dropping condenser. The device uses falling water drops to generate voltage differences by

Microsoft "Surface"

With its new Surface Tablet, Microsoft didn’t just break the mold. It smashed it into a million little pieces, chucked them all into the furnace and set the temperature to obliterate. There really is no precedent for what Microsoft did this week.

World's first wireless telephone.

A Photophone receiver and headset, one half of Bell and Tainter's
optical telecommunication system of 1880

The Photophone, also known as a radiophone, was invented jointly by Alexander Graham Bell and his then-assistant Charles Sumner Tainter on February 19, 1880, at Bell's 1325 'L' Street laboratory in Washington, D.C. Both were later to become full associates in