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Lintels: wooden scaffolding. Lever up one end of stone. Put tree trunk under it crossways. Do the same at other end. Repeat with additional tree trunks until stone on a platform or tree trunks. Start again this time standing on the platform you've just built under the stone. Sounds counter-intuitive, but there's a very good diagram somewhere that I can't find right now.
Stone: bluestones (4-6 tonne stones) from Preseli in Welsh Wales, 2950BC; sarsens (10-50 tonne stones) from Marlborough Downs about 25 miles north of Stonehenge, 2500BC.
No aliens, sorry. Lots of copulating at summer solstice though, in the bonking area of the field.
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simon
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