Is this a retraction of the hygiene hypothesis?

There are news about the hygiene hypothesis.

Home cleanliness resulted only in quantitative reduction of floor dust, which mainly indicates removal of superficial dirt with a rather cosmetic effect. Conventional cleaning does not eradicate microorganisms sustainably, because emptied microbial niches are instantly recolonized by ventilation and living carrier.

Sure. Continue reading Is this a retraction of the hygiene hypothesis?

U shape is good and bad

I did not expect that serum vitamin D levels are associated with mortality at both ends of the distribution as now shown by Dorup et al.

Out of 247,574 a total of 16.645 subjects died in the ensuing 0 -7 years. … 25-hydroxyvitamin D level of 70 nmol/L was associated with the lowest cardiovascular disease mortality risk … At the higher extreme (125 nmol/L), the hazard ratio of cardiovascular disease mortality was 1.3 (95% CI 1.2-1.4), with similar risk among men and women.

Following our first paper on U shaped vitamin D effects there are now more than ten papers show that. Vitamin D is not just good or bad for you, it is both!


Powerpoint drahtlos von Android auf Beamer

Die einfachste Möglichkeit ist wohl ein 35 Euro Chromecast Stick an die HDMI Schnittstelle des Beamers anzuschliessen. Der Stick braucht dann noch eine USB Stromversorgung — praktisch wenn der Beamer so etwas hat. Dazu noch eine einmalige Internetverbindung über einen mobilen Router, bei mir eine alte Fritzbox mit Freetz (leider funktioniert es nicht mit einem lokalem Hotspot von Android aus). Um nun von einem Android Powerpoint Folien abzuspielen, kann man “Focalcast” nehmen. Das gibt es allerdings nicht mehr im Playstore, dafür kann man auch “Google Präsentationen” hernehmen oder einen PDF Viewer.