[SunkenCiv]

Thanks Robert A. Cook, PE.

Toolmaking with stone should be on there, at or near the top — humans have gone from crude stone tools to scanning tunneling electron microscopes.

Also at or near the top, writing. Duh.

Here’s an unusual extra to the GGG list.

[colorado tanker]

The lever?

[Bernard Marx]

I think the birth control pill has changed our world fundamentally. It will strongly influence the future of Mankind.