Scientists from the Nanyang Technological University here have developed a "smart" window which can darken or brighten without the need for an external power source.
Scientists are developing a new kind of 'smart window' that can block out heat when the outside temperatures rise.
Scientists have developed a smart window that can let in light, block heat and generate power.
Day in Pics: 18th April
Showbiz World - April 18, 2015
PM Modi in Canada