• Please use real names.

    Greetings to all who have registered to OPF and those guests taking a look around. Please use real names. Registrations with fictitious names will not be processed. REAL NAMES ONLY will be processed

    Firstname Lastname


    We are a courteous and supportive community. No need to hide behind an alia. If you have a genuine need for privacy/secrecy then let me know!
  • Welcome to the new site. Here's a thread about the update where you can post your feedback, ask questions or spot those nasty bugs!


  1. Jerome Marot

    "Super-spreading" events play outsized role

    New research about the statistics of covid-19 transmission: https://news.mit.edu/2020/super-spreading-covid-transmission-1102 The study of about 60 super-spreading events shows that events where one person infects more than six other people are much more common than would be expected if the...