Crop circles in Finney County, Kansas, USA, 24 June 2001.

Souvenir seller on the beach, c 1905.

Molecular geneticist loading a thermal cycler.

Photographer Giraffe

Mischievous Falcon

Thermal model of the Mars Viking spacecraft, 1974.

Santa Ana volcano, El Salvador, 3 February 2001.

Title page to 'The Prophetical Hermetic Tripod', 1689.

Plume from Tanzania's Ol Doinyo Lengai Volcano

Culpeper's reflecting microscope, c 1728.

Microscopes, 1787.

Apparatus to demonstrate the thermal expansion of liquids, mid 19th century.