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Study of human genetics show how closely related we are to other , all over the world.

Advances in the dating of fossils and artifacts help determine the age of those remains, which contributes to the big picture of when different milestones in becoming human evolved.

Thousands of human fossils enable researchers and students to study the changes that occurred in brain and body size, locomotion, diet, and other aspects regarding the way of life of early human over the past 6 million years.

Millions of stone tools, figurines and paintings, footprints, and other traces of human behavior in the prehistoric record tell about where and how early humans lived and when certain technological innovations were invented.

Radiocarbon dating suggested it was built around 65 B.

By winding a knob on its side, the positions of the sun, moon, Mercury and Venus could be determined for any chosen date.

Newly revealed inscriptions also appear to confirm previous speculations that the device could also calculate the positions of Mars, Jupiter and Saturn — the other planets known at the time.

"The design is beautiful, the astronomy is exactly right…In terms of historical and scarcity value, I have to regard this mechanism as being more valuable than the Mona Lisa." The researchers used three-dimensional X-ray scanners to reconstruct the workings of the device's gears and high-resolution surface imaging to enhance faded inscriptions on its surface.

Precise astronomy The new analysis reveals that the device's front dials had pointers for the sun and moon — called the "golden little sphere" and "little sphere," respectively—and markings, which coincided with the zodiac and solar calendars.

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