Stonehenge mystery could rest on ball bearings

Neolithic engineers may have used ball bearings in the construction of Stonehenge, it was claimed today.
The same technique that allows vehicles and machinery to run smoothly today could have been used to transport the monument's massive standing stones more than 4,000 years ago, according to a new theory.
Scientists showed how balls placed in grooved wooden tracks would have allowed the easy movement of stones weighing many tons... Read More

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