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Permeable or impermeable?

Submitted by Michel Darche on

The study of the diffusion of liquids in the soil, also called percolation, allows scientists measuring how water is diffused in the soil, how fast aquifers refill, and to understanding the diffusion of gas, petrol and pollutants in the soil.
It is the English mathematician J. M. Hammersley who, in 1965, highlighted that diffusion and percolation also occur in telecommunication networks, the spreading of epidemics, propagation of fires, and the phase transition from water to ice.

Suzhi Kolangal/South Indian Traditional Art

In Tamilnadu, one would find a finest drawn and artistic drawing decorating every house at the front entrance.

These drawings are not just merely a decoration, but it has lot more significance to this practice.

During festival seasons and on any auspicious functions, the drawing is drawn still larger even extending up to the street! A classic example can be noted from these, a woman’s creative at its best, talent to make it an even more attractive.

A kolam is a geometrical drawing composed of curved loops drawn around a grid pattern of dots. It is sometimes called Rangoli and can be very elaborate and colorful.

Kolams originated about 2500 BC in the Indus Valley Civilization and are believed to help bring wealth and prosperity to the home or business.

Kolams are thought to bestow prosperity to homes.

Every morning in Tamil Nadu, millions of women draw kolams on the ground with white rice powder
(Reference Wikipedia)

School Taskbook: From 5 to 15

Submitted by IMAGINARY on

The taskbook for school students by renowned Russian mathematician Prof. Vladimir Igorevich Arnold. You can find the original Russian version as well as an English, German, Spanish, Italian, Vietnamese and Turkish translation.

If you are interested to add a new translation, please see the github repository of the booklet for all sources and details.

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