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Then,
after making the transition to a settled way
of life, clay was used in the construction of
houses. It was spread on floors, walls, hearths
and roofs, mixed into mortar, and smeared over
storage vessels and storage rooms made of reeds
or wicker. Only later did people discover that
when clay was heated by fire it became stronger
and harder, and they began to heat their figurines,
jewellery and other small objects. As they gradually
gained understanding of the chemical properties
of clay, they learned to control the fire required
to harden it, and then learned to combine this
knowledge to make pottery vessels, so achieving
one of the greatest revolutions that marks the
Neolithic age.
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