Neil Aldridge / Zu/'hoasi Bushman women preparing food using a wooden pestle and mortar in the Kalahari, Botswana. April 2012.

Enrique Lopez-Tapia / Hand grinding grain in a mortar with small child, Bassari country, east Senegal. This area became a UNESCO World Heritage site in 2012, for cultural landscape and traditions kept by the the Bassari,...

Enrique Lopez-Tapia / Women pounding grain in a mortar by hand, Bassari country, located east Senegal. This area became a UNESCO World Heritage site in 2012, for cultural landscape and traditions kept by the the Bassari, F...

Jack Dykinga / Grinding stones in Mayan Ruins, Oxkintok, one of the oldest cities in the Yucatan with hieroglyphic inscriptions showing some of the earliest dates known in the Yucatan.

Benoit Stichelbaut / Skipper Michel Desjoyeaux grinding on his trimaran "Geant", Route du Rhum race, September 2006

Benoit Stichelbaut / Armel Le Cleac'h grinding aboard 60ft Imoca monohull "BritAir", Concarneau, Brittany, 22 April 2008.

Billy Black / Two men sailing onboard Lagoon 470 yacht, British Virgin Islands, January 2004. Model and property released.

Rick Tomlinson / "Green Dragon" crew and "Puma" (background) in-port race training in Alicante, Spain, for the 10th Volvo Ocean Race 2008-2009. For EDITORIAL USE only.

Rick Tomlinson / "Green Dragon" crew and "Puma" (background) in-port race training in Alicante, Spain, for the 10th Volvo Ocean Race 2008-2009. For EDITORIAL USE only.

Daniel Heuclin / Pre-Colombian corn grinding holes, Oliver Lee State Park. New Mexico, USA, August 2009

Pete Oxford / Macushi woman grinding cassava, Yupukari village, savannah, Rupununi, Guyana, August 2009

Peter Lewis / High Salvington windmill a black post mill built before 1750, and ceasing work by 1900, restored to full working order and grinding flour, High Salvington, Sussex, England, UK. March 2009

Philippe Clement / Mountain stream in the Alps with meltwater from a glacier, called glacier milk because the water contains particles of rock and minerals from the grinding action of the glacier, Italy

Steven David Miller / Grinding hole used in the creation of Aboriginal Xray-style art at the Ubirr Rock Art Shelter, Kakadu National Park, Northern Territory, Australia Restrictions: Editorial use only

Pete Oxford / Secoya Indian shaman grinding maize, Rio Agua Rico, Ecuadorian Amazon, 1994

Jack Dykinga / Anasazi indian grinding hole in 'Perfect Kiva' ruins with corn remains on sandstone, Grand Gulch Primitive Area, Utah, USA

Jose B. Ruiz / Traditional windmill for grinding corn, Formentera Is, Balearic Islands, Mediterranean

Nigel Bean / Stone water mill for grinding maize, Palas Valley, Northern Pakistan

Pat De La Harpe / Zulu woman grinding corn Natal, South Africa

John Cancalosi / Shangani women grinding sorghum. Zimbabwe, Southern Africa

Paul D Stewart / Illustration of American Mastodon (Mammut americanum) tooth. 'The back grinding tooth of the mammoth or Mastodon of Ohio, weight 4lb and 11oz, drawn and engraved by Springsguth from life'. Forming the...

Onne van der Wal / The crew onboard "Maximus" working together at the start of the 2006 Newport to Bermuda Race, Rhode Island, USA.

Onne van der Wal / Brian Thompson, skipper of Open 60 "Artemis Ocean Racing" grinding.

Rick Tomlinson / Crew member aboard "EF Language" faces away from the spray on the deck in the Southern Ocean during the Whitbread Round the World Race, 1997-1998.

Rick Tomlinson / EF Language with an all-female crew race in the Whitbread Round the World Race, 1997.

Rick Tomlinson / "EF Language" with an all-female crew race in the Whitbread Round the World Race, 1997.

Rick Tomlinson / Maxi yacht "Rothmans" for the start of the Sydney-Hobart Race, 1991.

Rick Tomlinson / Kate Pettibone on the grinder of "Team EF" during the Whitbread Round the World Race, 1997.

Rick Tomlinson / EF Language with an all-female crew race in the Whitbread Round the World Race, 1997.

Rick Tomlinson / Crew at work aboard "The Card" under full sail, in the Whitbread Round the World Race, 1989-90.

Rick Tomlinson / Crew winch in the sails on the coffee grinders following a sail change on the "The Card" during the Whitbread Round the World Race, 1989-90.

Rick Tomlinson / Team New Zealand race upwind at the America's Cup, 2001.

Rick Tomlinson / Cockpit full of water as "The Card" moves through the Southern Ocean on Leg 4 of the Whitbread Round the World Race, 1989-90.

Rick Tomlinson / British team aboard the "Barlo Plastics" Mumm 36 race in the Admiral's Cup, Adrian Stead trims the spinnaker, 2000.

Rick Tomlinson / Crew in rough conditions on "The Card" in the Southern Ocean during the Whitbread Round the World Race, 1989-90.

Onne van der Wal / Winching in sheets on coffee grinders.

Onne van der Wal / Winch grinders working at full speed in the cockpit, America's Cup.

Onne van der Wal / Welder grinding the hull of a yacht.

Onne van der Wal / Boat builder grinding metal in a shipyard's metal workshop.

Onne van der Wal / Winch grinders working at full speed in the cockpit, America's Cup.

Onne van der Wal / Swan 70 "Strabo" racing at a Swan American Regatta in 2003.

Rick Tomlinson / Crew on "EF Language" wear full heavy weather clothing including googles to prevent the salt water spraying into their eyes during the Whitbread Round the World Race, 1997-98.

Onne van der Wal / Crew in wet-weather gear working aboard yacht "Flyer", Whitbread Round the World Race 1981-82.

Dr. Axel Gebauer / Two men grinding barley with traditional mill stone at watermill, Dargye, Sichuan Province, Tibet, China

Erwan Quéméré / Australian team at work during Round Robin 3 of the America's Cup 1995. Fremantle, Australia.