For cybersecurity reasons, sailors on U.S. Navy vessels can't always use smartphones and tablets. And in the cramped quarters of a submarine, there's little room for shelves full of books.
* Toshiba gains on upward revision hopes * Toyota's weak forecast priced in - traders * Rakuten tumbles on poor quarterly results By Ayai Tomisawa TOKYO, May 9 (Reuters) - Japanese stocks edged higher on Friday in choppy trade as investors...