The biggest technological breakthrough ... what has changed our lives the most?

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What, do you think, is the biggest technological breakthrough that has insfluenced our lives the most? If you look back just a few years our lives have changed a lot, not to mention if you look a few decades back. Today we are using the internet daily - life without it would be unthinkable to most people, computers have made giant steps in the past 10-20 years, mobile phones have become another thing we can't function without. So what do you think has made the biggest change in our lives? I have mentioned just a few things that are part of our everyday lives wether you are a teenager or grandparent, but there are many other things that we are using every day and without which our lives would be "impossible" ... although we lived without them just fine in the past! ;)