How Han expansion helped create the Silk Road

Han expansion helped open the Silk Road

Han military expansion against the Xiongnu helped establish the Silk Road, linking China with lands farther west through trade. Sea routes also connected China with Southeast Asia and India.

Old wood-pulp paper slowly destroys itself

Chemicals used to make much wood-pulp paper in the 1800s and early 1900s left it acidic. Over time, the acid breaks the paper down until it becomes weak and brittle. The process has been called a "slow fire" because the paper gradually destroys itself.

The Pantheon’s sunlight marks time indoors

The Pantheon’s open roof lets sunlight move across its interior, where the light itself marks time rather than a shadow. Rain also enters, but an inclined floor and drains carry it away.

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How Han expansion helped create the Silk Road

Han expansion helped open the Silk Road

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