Probing Question: How and why was Stonehenge built?

From the grassy deserted plains of southern England rises a circle of standing stones, some of them up to 24 feet tall. For centuries they have towered over visitors, offering tantalizing hints about their prehistoric past. ...

Graffiti-free historic buildings: New polymer coating to help

(PhysOrg.com) -- Many a historic landmark is defaced with graffiti, but the spray paint can only be removed - if at all - using caustic solutions which risk damaging the underlying surface. A new breathable coating provides ...

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