Global Positioning System aka GPS

The GPS is a network of 24 navigation satellites orbiting the Earth that people can use to pinpoint their position. THe satellites orbit at a height of 20,000 kilometres(12,500 miles). A GPS receiver picks up signals from any of these satellites that are above the horizon. It uses information in each signal to work out how far away it is from the satellite. It can calculate its position from the

Airtel to start selling Xiaomi Redmi Note 4G from 1st week of Jan

Xiaomi, which operates in India under the brand name Mi, has announced the launch of its Redmi Note in India a few week back for Rs 9,999.