Examples of Mainly Corporate Funded Think Tanks: Brookings Institution With a budget of US$ 23 million and assets worth US$ 192 million the Brookings Institution, based in Washington D.C., in 1998 was funded by: Corporate and private donations (38 %), endowment (30 %), revenue from conferences and seminars (18 %), sales of publications (9 %), government support (2 %). Among the 138 corporate donors are: Bell Atlantic, Citibank, J.P. Morgan, Goldman Sachs, NationsBank, Exxon, Chevron, Microsoft, Hewlett Packard, Toyota, Pfizer, Johnson & Johnson, Dupont, Mobil and Lockheed Martin, and the foundations of companies like American Express, Travelers, AT&T and McDonnell Douglas. A few media conglomerates, like Time Warner and the Washington Post Co.. Contributions of individual donors include executives from Visa, Procter and Gamble, BankAmerica and U.S. Airways.

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Roman smoke telegraph network, 150 A.D. The Roman smoke signals network consisted of towers within visible range of each other and had a total length of about 4500 kilometers. It was used for military signaling. For a similar telegraph network in ancient Greece see Aeneas Tacitus' optical communication system.

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