- A 2019 MIT Technology Review article was cited describing a Pentagon laser system that can identify individuals at a distance by their unique cardiac signature, highlighting emerging deanonymization risks.  
- A YouTube demo (youtu.be/EhZXDgG9oSk) shows extracting a person’s pulse from subtle head motions in ordinary video, underscoring how physiological signals can be recovered from public footage.  
- Discussion of a new graphene-based circuit claimed by physicists to generate “clean, limitless power” from ambient thermal energy; participants debated whether the effect is real, an artifact of measurement, or a misinterpretation of the second law of thermodynamics.  
- Nano-engineering CAD files for DNA-origami gears and PAM-test DNA structures were shared (GitHub: kanzure/nanoengineer), prompting questions about scalable manufacturing routes for such nanoscale devices.  
- A commercial UV-C mask project (Kickstarter: UVMask) was analyzed: it uses 265 nm LEDs, quartz optics, dual-battery redundancy, silicone sealing, and allows users to cut replacement filters from standard N95 material, with the claim that 265 nm light avoids ozone generation.