Technology that changed man's life

Over the period of time Man's life style has been made much easier and comfortable with the evolution of technology

What can be that which brought about the most drastic change?
Some hints to ponder on and share your views

• Wheel that mobilised humans beyond dream
• Steam power That added fuel to the flame of quest
• Light in the darkness (Bulb)
• Machine that made us all lazy (Computer and related gadgets)
• Nano science ( revolutionised medical field with its proposals

Well it is fair game to add things to the list and debate on CEans