Well, here is a question that popped into my mind when I was trying to open a simple calculator. Calculators store numbers in binary form, depending on the present or abscense of electrical current, according to http://mathforum.org/library/drmath/view/52503.html". What devices are behind this process? Wires, batteries, semiconductor materials, transistors... how they are put together? Do you think the information that Wikipedia provides is sufficient? I hope this is a good question. Thank you in advance.