- The EmDrive propulsion claim was definitively debunked; the previously reported thrust was attributed to thermal expansion, ending years of controversy.  
- Discussion of alternative propulsion concepts included Robert Zubrin’s “dipole drive” for accelerating solar wind and JAXA’s IKAROS solar-sail demonstrator, which uses radiation pressure and liquid-crystal panels for attitude control.  
- Participants explored the energetics of liquid-crystal actuators in solar sails, speculating that the activation barrier between states must exceed solar pressure for reliable maneuvering.  
- A geo-engineering test flight for Stratospheric Aerosol Injection (SAI) was cancelled; links to the SSC Space announcement and the Wikipedia overview were shared.  
- Viloxazine (Qelbree), a selective norepinephrine reuptake inhibitor, was noted as newly FDA-approved for ADHD in April 2021.  
- A confirmed human case of superfetation—simultaneous gestation of embryos from different menstrual cycles—was highlighted.  
- A historical-cryptography paper, “Cryptography during the French and American wars in Vietnam,” was linked for further reading.