Historical tech tree

This historical tech tree is now my favorite way to explore history—a searchable timeline of discoveries, inventions, and tools spanning the ages. You can search by field, year, person, or by the name of the “tech”—which, by this website’s definition, is “a piece of knowledge (an idea) that is created intentionally by humans for a practical purpose (not for its own sake) and is implemented in some kind of physical substrate.” Each tech links to a Wiki page, or branches to other techs that it either built upon or led to. You never know where you'll end up—I just learned all about water clocks. I love this navigable visualization of human innovation, and it's inspiring to imagine what lies ahead of us. — CD