What do you think is the most useful invention of the century?

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Inventions. Gadgets. They make life more comfortable. Many inventors have contributed to the modern world today. Some say that the invention of computers is the most useful invention of the century. Others say it was the internet. Still others could attest that it is the vacuum cleaner or the TV. I'm sure all of us have different opinions about it. That is why I created this forum. The question is not only limited the those inventions that were made in the 21st century. Since most of the things that we enjoy today was invented in the 20th century, specifically from 1950s and above, you can include all those inventions and innovations that were created from the previous century from the early 1900s until the late 1990s.