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Shout it out When doing strenuous exercise such as weightlifting, it seems to help to call out the number of repetitions. (continued) Tobias Bast School of Psychology, University of Nottingham, UK I wanted to pick up on a previous response to this question, which suggested that neurons in our brains are continuously replaced and an 80-year-old would retain virtually no neurons from their 20-year-old brain. Functionally, the number on one side would act like an anchor to the number on the other side, so we wouldn't have to count all 20,000 people, just the ones on the side where the anchor fails. [Extracted from the article]

I enjoyed your 'Roadmap' to a fairer economy (NI 450), and I thought there were a lot of good suggestions in it (and some very interesting statistics). However, I thought [...]

Several letters to the editor are presented in response to previous articles including articles in the August 27, 2016 issue by Zoltan Istvan on decoupling science and technology policy from short-term planning of political establishments and evidence-based government policy, and an article in the September 3 issue on when the Anthropocene epoch started.