To provide a clickable link for the site presented here by Marie-Ange a few minutes ago, I can heartly recommend http://www.npl.co.uk/wmd This is a site at the National Physics Lab in Middlesex, England. One drawback of the site is that the "clock check" apparently does not take into account the setting of daylight saving time in the computer's clock. I commented on that and on the choice of colors for their estimation test, but the experiments they provide are worth trying! Jim -- Metric Methods(SM) "Don't be late to metricate!" James R. Frysinger, CAMS http://www.metricmethods.com/ 10 Captiva Row e-mail: [EMAIL PROTECTED] Charleston, SC 29407 phone/FAX: 843.225.6789
