What’s the greatest invention EVER! ?

Fire

Wheels.

The 'WHEEL'

It has been used since pre-history. Nothing today would move without the use of a 'Wheel'.

agriculture

The automatic washing machine.

The ballpoint pen - particularly the production method as developed by Biro.

A just to mention, whoever first conceived that a differential gearbox was even possible is a genius IMHO.

I think the WINDOWS or GLASS invention is WAY UNDER RATED. Think of everything that we would not have without them. From computers, to cars, to house windows, to mirrors, to bottles, etc etc etc

The internal combustion engine

Johannes Gutenberg (1398 – 1468) was a German blacksmith, goldsmith and printer who invented the printing press and movable type. Before Gutenberg all books had been hand written or stamped out with fixed wood blocks. Gutenberg combined two existing ideas – the power of a wine press and the detail of a coin punch to create the printing press.

Larry Gormley

During the technology feeding frenzy of the late 1990s many experts declared the Internet one of the most important inventions since the Industrial Revolution. However, after the happenings of the past few years that perspective has changed. While the Internet and the World Wide Web have certainly impacted the lives of many millions of people it is certainly not the greatest invention of the past millennium, in fact it might not even make the the top ten.

Me