What is Iris scanning? How it is different from fingerprint scanning?

We, human beings, have 3 things which are unique in each and every individual. They are fingerprints, DNA and iris pattern. Most of you must know about fingerprints and DNA scanning as they are widely used now-a-days. But do you ever thought how iris in our eyes helps to get us authenticated?

What is Inverter AC? How it is different from normal AC?

Summer is in dominant mood and everyone is looking forward to get relief from it. Most of us are using air conditioners (AC) for the same. I hope you must aware of a normal AC which is available in most of the electronics shop. But, Do you know, there is another type of AC known as Inverter AC?