Everyone has their own copy of the textbook supplied by the central education authority, Monbusho, as part of the concept of free compulsory education up to the age of 15.
Since much of this energy comes from the utilisation of fossil fuels, wastage of food potentially contributes to unnecessary global warming as well as inefficient resource utilisation.
Because anything after that URL suddenly becomes a new top level section. So you can go to any / and then tack on /issues or maybe /wiki and get the same page, but under a different namespace.