Estimated damage caused by 'Mafiaboy', the 15-year old Montreal hacker -- US$1.7 billion. Number of mischief charges to which 'Mafiaboy' pleaded guilty -- 55. Months he will spend in a youth detention centre -- 8. Increase in inquiries about videoconferencing to TeamWave Software Ltd. after September 11, 2001 terrorist attacks -- 50% ADCOM Videoconferencing's estimate of unused, existing videoconferencing capacity -- 50% Cost of low-end videoconferencing equipment -- US$2,000 Cost of high-end videoconferencing suite -- US$50,000 Loss in value of U.S. stocks ten days after September 11 attacks -- US$ 1.2 trillion Estimated layoffs due to Hewlett-Packard purchase of Compaq -- 30,000 Estimated savings of HP-Compaq deal -- US$2 billion in 2003