Systolic blood pressureA meta-analysis of a vast amount of data from randomised controlled trials and cohort studies reports a strong and continuous dose-response relation between levels of systolic blood pressure and risk of ischaemic heart disease over the range 100 to 200 mm Hg. This puts paid to ideas of a J shaped curve where low blood pressure levels are harmful, and to the notion that a threshold separates hypertension and normal blood pressure. A level of 130 mm Hg, for example, was found to carry an 80% increase in the risk of ischaemic heart disease compared with a pressure of 100 mm Hg (Nat Med doi:10.1038/s41591-022-01974-1).MistletoeThe sticky goo in mistletoe berries, viscin, helps the dispersal and propagation of the plant by clinging to the beaks of birds that eat the berries and the bark of the trees that they wipe their beaks on. Viscin also adheres strongly to synthetic…

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