Italy per 1,000 people) and 4,015,000 goods vehicles circulated on the national road network. The national railway network, state-owned and operated by Rete Ferroviaria Italiana, in 2008 totalled of which is electrified, and on which 4,802 locomotives and railcars run. The national inland waterways network comprised of navigable rivers and channels in 2002. In 2004 there were approximately 30 main airports, including the two hubs of Malpensa International in Milan and Leonardo da Vinci International in Rome, and 43 major seaports, including the seaport of Genoa, the country's largest and second largest in the Mediterranean Sea. In 2005 Italy maintained a
What Is Intelligence? What Is Intelligence? What Is Intelligence?: Beyond the Flynn Effect is a book by psychologist James R. Flynn which outlines his model for an explanation of the eponymous Flynn effect. The book summarizes much of the work of Flynn in this area, as well as that of his colleague William Dickens of the Brookings Institution. The book begins with a description of what has generally become known as "the Flynn effect": the steady rise from one generation to the next in average scores on IQ tests over time. Flynn notes that this effect apparently contradicts some fundamental beliefs about IQ