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A sledge glides far more easily over firm desert sand simply because the sand does not pile up in front of the sledge as it does in the case of dry sand. A person standing on the front of the sledge wets the sand.

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We still do not fully understand the behaviour of granular material like sand. The research was supervised by FOM group leader professor Daniel Bonn and is part of the FOM programme 'Fundamental aspects of friction'.

Experiments have demonstrated that the correct amount of dampness in the sand halves the pulling force required.

Firm sand The physicists placed a laboratory version of the Egyptian sledge in a tray of sand.

I've decided to create a 2 level Tab Menu based 5 of the CSS horizontal menus found here.

Turn to this script when you need your CSS menu to support a second horizontal level.

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