WEDNESDAY - not Monday - is the worst day of the week, according to research by two American applied mathematicians. Professors Christopher Danforth and Peter Dodds, of Vermont University, analysed words used in 2.4 million internet blogs such as Twitter, giving a score out of nine depending on how positive they were. Words like free, fun, rainbow and sex all scored above eight, while words such as betray, cruel, hatred and suffocate all scored less than two. Saturday and Sunday rated predictably well but, perhaps surprisingly, Monday came out as the second happiest day of the week, partly because people were still reminiscing about the weekend. However by Wednesday, these feelings had subsided. Professor Danforth said: Peoples daily experience is being reflected somewhat in what theyre saying. And this is more of a story, we think, for Twitter messages, which weve just started to pay attention to, about a year ago. They think they are communicating with friends, but since blogs are public were just looking over their shoulders. The weekends tend to be fairly happy and Wednesday turned out to be the saddest day. Telegraph He said using the internet in this way enabled them to rate happiness based on higher numbers of people than previous studies. What were attempting to do is measure collective happiness on a much larger scale, similar to measuring the temperature outside, Professor Danforth said. The energy of a few molecules bouncing around doesnt give a good indication of heat, you need billions or more.