Your View: What is the greatest human invention?

After a brief hiatus, we have our latest “your view”. So far many of the topics have been on especially controversial subjects, so today we get one which is less controversial but likely to have the most varied answers.

What is the greatest human invention?

My answer: The Internet. This is partly for selfish reasons – the internet has taught me more than anyone or anything else – for that reason it is the most important invention that has an effect on my life. What is the greatest invention in your opinion and why?