Egyptian procesional boat, c 1300 BC.

Setting up a polymerase chain reaction (PCR), Institute of Child Health, London, May 2000.

Celestial globe, 1693.

Egyptian ship, c 1300 BC.

'The Karnak Clepsydra', Egyptian celestial diagram, c 1400 BC.

Egyptian procesional boat, c 1300 BC.

Celestial globe, 1693.

Buddhist prayer wheel made from a human skull, Tibetan, 18th-19th century.

Celestial globe, 1693.

'The Karnak Clepsydra', Egyptian celestial diagram, c 1400 BC.

Model of an ancient Polynesiam double saili

'Use of the Merkhet in Ancient Egypt'.