Ecology

problema del taglio unico

Origami plans and a single cut problem: how to get figures with a single cut

The single cut problem It is a geometric mathematical problem that explains how it is possible to obtain some origami plansthat is, complex figures by cutting a sheet along a single line. They are also called floors and their invention dates back to 1721, when the Japanese mathematician Kan Chu sen presented them as stratagems to test mathematical intelligence. Let’s ...

freedom flotilla coalition

Israel attacks Freedom Flotilla’s ship: what the UN Convention on Sea Right says

The crew of the Madleen ship of the Freedom Flotilla Coalition during the attack by the Israeli marine forces. Credit: FCC The Israeli Navy intercepted and attacked the ship Madleena boat managed by the organization Freedom Flotilla Coalition And started on June 1 from the port of Catania to the Gaza Strip with the aim of supplying the Palestinian population ...

exit poll

Exit poll and surveys on the vote: how they are made and how reliable they are

Whenever in Italy we are called to votewe start talking about exit poll and of Forecast on the final vote immediately after the closure of the polls. This will also be the case in the case of the referendum of 8 and 9 June, which for 13 Italian municipalities also coincides with the administrative elections. But what exactly these forecasts ...

theremin

What is Theremin, the musical instrument that is played without contact

The Theremin It is one of the most fascinating and mysterious musical instruments in history. Not only is it one of the very first electronic toolsbut it is also the only one in the world playing without ever touching it: a musician, with the hands alone, can shape the air and the soundlike a magician who draws invisible notes. The ...

kilt

History and tradition of the Kilt, the most famous garment of Scotland

The kilt It is a male garment of fabric that envelops and tie in life, typical of the Scottish tradition that was born in the eighteenth century. In a first version it also included a higher part that stared behind and offered a wider one protection From cold, wind and rain. The English entrepreneur Thomas Rawlinsonhowever, he created a more ...

scossa dito effetto punta

Why does it happen to take the shock when we touch something?

Shock touching something is an experience common, almost on the agenda. Behind this annoying phenomenon there is a physical principle known as tip effect. It is a typical behavior of the bodies that can be loaded electrically – as well as the human body – and that, coming into contact with other objects or people, suddenly unloading the accumulated electricity, ...