This may be the greatest combination of plastics and Stonehenge I've come across. (If we don't include the tiny foam Stonehenge models used in the movie This Is Spinal Tap.)
A researcher used plastics to replicate the circular stone monument in England as it would have looked when it was built 4,000 years ago to test a theory that the stones provided the perfect acoustic setting for whatever ceremonies took place there, Richard Grant writes in Smithsonian Magazine.
Trevor Cox, an acoustical engineer at the University of Salford in Manchester, England, led the experiment and used 3D printing to recreate 27 of the stones and a silicone mold to replicate another 130 stones.
"What we found ... was thousands upon thousands of reflections as the sound waves bounced around horizontally," Cox told Smithsonian. "You can compare it to singing outside, and then singing in a tiled bathroom: Your voice sounds better in the bathroom."