The rates of data transfer, it should be said, were quite slow. But using 16 different channels of twist across the span of a city centre is an impressive display in the growth of the technique.

Solution time on the Tower of Hanoi task correlated highly with two centre executive tasks and three spatial spans, but not with the verbal working memory span.

The weight of the building is absorbed by the key stone in the centre of the arch, and distributed evenly over the entire span of the arch and then down into these two side pillars.