British psychologist Professor Richard Wiseman (University of Hertfordshire) invites the public to take part in an ambitious five-day experiment that aims to boost the UKs happiness. Participants will first rate their mood and then be randomly assigned to one of four groups. People in each group will watch a video describing one of four techniques commonly used to boost happiness, and use the technique during each day of the study. At the end of the experiment everyone will reassess their mood, allowing the research team to identify the most effective way of making people happy.
Read more about it here: Scientists Announce Mass Participation Experiment To Cheer-up The UK (ScienceDaily.com)

The experiment begins on Monday 3rd August, and those wishing to participate can visit the project website at http://www.ScienceOfHappiness.co.uk at any time during the five day experiment. The results will be announced on Tuesday 11th August.