Zhangye once stood along the Silk Road as a trade hub.

Memories are reconstructed each time you recall them.

Fact #1812 · General

The polio vaccine drastically reduced cases worldwide.

Fact #1193 · General

The Mayans developed a complex calendar system.

Fact #604 · General

The eruption of Mount Vesuvius buried the city of Pompeii.

Fact #812 · General

First impressions can form within seconds of meeting someone.

Fact #954 · General

Nothing can travel faster than light in a vacuum.

Fact #1777 · General

Sound cannot travel through a vacuum.

Fact #136 · General

The New Deal introduced major economic reforms during the 1930s.

Fact #1099 · General