̽��ֱ��

A new detailed study of notes and sketches by Leonardo da Vinci has identified a page of scribbles in a tiny notebook as the place where Leonardo first recorded the laws of friction. ̽��ֱ��research also shows that he went on to apply this knowledge repeatedly to mechanical problems for more than 20 years. 

Scientists have discovered that, when upright, stick insects don’t stick. Instead, they deploy special hairy pads designed to create huge amounts of friction from the tiniest of pressure increases - ensuring that the insects grip but don’t stick.