What is this page?

Every item on the site is a dot, and every connection is a line. Drag dots to untangle them. Click a dot to read about it; its neighbours light up and everything else fades. The busiest dot is where the action is.

Words we use: Mystery A question nobody has answered yet. Clue from people Something people wrote down or told long ago: a chronicle, a diary, a story, a carving. Clue from nature Something nature recorded by itself: tree rings, ice, rock layers, or the leftovers of an exploded star. Hunch Our guess that a clue from people and a clue from nature are about the same event. Book or paper Where we read it, so anyone can check our work. Step Something we did, in the order we did it.