We started hibernation. From 10 January we start catching up what we missed. Happy restful Holidays! 😊🎄🧘💤
Our Review 2021 on Twitter still continues and there is a new smartphone practical on the Doppler effect for cycling by LEIFIphysik (in German) with a corresponding YouTube video to enjoy in the meantime.
Finally, you should totally check for news here on Christmas Eve…