Saturday Science: It Was the Gardener

who solved one of the mysteries of Stonehenge:

One of the many mysteries of Stonehenge may have been solved, not because of a brilliant scientific breakthrough or thanks to painstaking research, but after a maintenance team’s hosepipe turned out to be a little short.

Archeologists have long argued over whether the ancient monument was once a perfect circle or if it was always, as it is now, an incomplete ring.

When a hosepipe used to keep the grass green in hot spells failed to reach a broken part of the circle, unsightly brown patches began to appear. Custodian Tim Daw was fretting over the blemishes when he realised they matched the spots where stones would probably have stood if the monument was a complete circle.