To the article ''Thia-Diels–Alder reactions of hetaryl thioketones with nonactivated 1,3-dienes leading to 3,6-dihydro-2H-pyrans: evidence for a diradical mechanism'' by Grzegorz Mlostoń, Paulina Grzelak, Anthony Linden, Heinz Heimgartner

Heinz von Foerster proposed that the observer should be included in the domain of observation. He suggested that this approach to cybernetics be called second-order cybernetics. Heinz was primarily interested in understanding cognition, based on neurophysiology and mathematics. But there has also been strong interest in cybernetics as a theory of social systems. Using the “second order” idea fo...

Christian Pfister / Heinz Wanner, Klima und Gesellschaft in Europa. Die letzten tausend Jahre. Bern: Haupt Verlag 2021. 424 S., zahlr. Farb- s/w Abb. ISBN 978-3-258-08152-3. Geb. € 49,–