• 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

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  • 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

    Reducing transmission of SARS-CoV-2

    A summary on airborne transmission through droplets and aerosols and effectivity of masks to control such: https://science.sciencemag.org/content/early/2020/05/27/science.abc6197
  2. R

    Playing it safe

    My mother (isolated in her home a couple of hours from where we are staying), has been sewing up a storm making fabric masks for everyone she can think of - sending them by mail and having friends drop by and deliver them. Yesterday Anne and I picked up all the ones she has for our family. We...