That is interesting. Can you cite a source for this? D deficiency appears to be a factor, but in reverse [1].

[1] https://www.mayoclinic.org/diseases-conditions/coronavirus/e...

I do not understand what you mean with 'in reverse'. I am aware that there is no solid scientific evidence for a positive effect of vitamin D supplementation with respect to COVID-19, but I understand that the article does not exclude it. Yes, it does mention that treating people with high doses of vitamin D who are already seriously ill, has no significant effect. but that does not exclude the possibility that not having a vitamin D deficiency could prevent you from becoming seriously ill with certain types of infections.

I understand that there are some mechanism where vitamin D is linked to the immune system, as described in, for example: https://eje.bioscientifica.com/view/journals/eje/183/5/EJE-2...

Breville electric kettle for the tea drinker

Some companies list certification requirements as a plus to their job description. While I don't care much about certificate/badge - it's a good motivator to learn beyond everyday work.

Mercedes[1] has drowsiness detector, it observes the driver through sensors. It's freakishly accurate.

[1] https://media.daimler.com/marsMediaSite/en/instance/ko/ATTEN...