From the quipu to the conquistadors, writer Rob Rath talks about cool stories we couldn't quite squeeze into the series, as ...

There's a lot that we don't know for sure about the Inca Empire, because we have conflicting accounts among Spanish ...

The Incas had a system of accounting that relied on the quipu. Cords of various colours were attached to a main cord with knots. The number and position of knots as well as the colour of each cord ...

A quipu could be used to count a variety of things ... which thrived during the third millennium B.C.E., to the continent-spanning Inca Empire and its predecessors. Although counting with knots ...

but even ancient civilizations kept records. While much of the world used stone tablets or other media that didn’t survive the centuries, the Incas used something called quipu which encoded ...