“No one can pass through life, any more than he can pass through a bit of country, without leaving tracks behind, and those tracks may often be helpful to those coming after him in finding their way.”
Robert Baden-Powell
Cerca nel Blog
lunedì 10 ottobre 2016
P.O. prisma esagonale sezionato con un piano parallelo a PV
Nessun commento:
Posta un commento