How quipus represented zero without a knot

A missing quipu knot could mean zero

On many quipus, knots placed at different heights on a cord represented ones, tens, hundreds, and larger numbers. Leaving one of those positions empty meant zero, allowing a single cord to record one or several numbers.

A child's genes can help shape the environment they grow up in

Inherited traits can affect which experiences a child has. They can change how other people respond to the child and which activities the child chooses. This makes it difficult to separate the effects of genes from the effects of the environment.

Wood mice can place their own landmarks

Wood mice have been seen placing noticeable leaves and twigs as markers while searching for food. They can move the markers as they explore. Instead of using only landmarks already around them, the mice can create their own.

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How quipus represented zero without a knot

A missing quipu knot could mean zero

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