Space, Earth and the natural world, explained.
A 4,500-year-old logbook, a ramp with post holes and a buried branch of the Nile have filled in how Egyptians built the Great Pyramid of Giza. Here is what the evidence says.
Every plant and animal takes in a trace of radioactive carbon while it lives and stops when it dies. Here is how scientists turn that slow decay into a date, what can and cannot be dated, and why tree rings keep the clock honest.
Stonehenge was built and rebuilt over roughly 1,500 years, with stones hauled from Wiltshire, Wales and, it now appears, northern Scotland. Here is the timeline and what the evidence says it was for.
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