The questions of the history of science, placed on a map. Where and when each question was born, and which question led to which.
There are six eras — asking, connecting, observing, measuring, unsettling, building. Tap an era on the bar below to keep only its points; tap a point to open that discovery's card: the time and place, why anyone asked, what was found, and the question left over.
Fields are coloured separately: mathematics, physics, chemistry, biology, astronomy, earth science, engineering. Show one field to follow how a branch grew, or show them all to see what different fields were asking in the same century.