- A Belgian-Dutch aerodynamics study (medium.com/@jurgenthoelen) and accompanying ANSYS simulation video (twitter.com/bertblocken) were shared, arguing that runners and cyclists should maintain 4–5 m lateral separation to avoid slip-streaming respiratory droplets; participants debated whether outdoor cross-breezes and rapid dilution make the risk negligible.  
- Participants discussed the physics of droplet dispersion: most large droplets settle within seconds, while ~1 µm aerosols can linger; sunlight, vegetation, and cubic-kilometre-scale dilution were cited as mitigating factors outdoors.  
- The concept of “initial viral load” was highlighted via Zvi Mowshowitz’s blog post (thezvi.wordpress.com/2020/04/01/taking-initial-viral-load-seriously), which argues that lower exposure doses may lead to milder COVID-19; a New Scientist article (newscientist.com/article/2238819) was also linked as supporting evidence.  
- Ethical objections were raised against deliberate low-dose human-challenge trials until better therapies exist, despite their potential to quantify dose–response relationships.  
- A Science Advances paper (advances.sciencemag.org/content/6/11/eaaz0087) on the “temporal circuit of macroscale dynamic brain activity supporting human consciousness” was shared; the group distilled it to the takeaway that large-scale neural synchronization is critical for conscious states.