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Happy hormones | Fuel costs | Drive-in parking | Guys and girls | Young or old? | Singapore pollution Re your report (‘Pull the plug’: protesters resort to direct action against AI firms, 6 October), the US neuroscientist Ben Rein has shown that there is a fundamental difference in our cognitive response according to the type of interaction we have. In-person meetings and conversations show a dramatic increase in serotonin, oxytocin and dopamine – “feelgood” hormones – compared with online interactions. I have been encouraged to speak to people at bus stops. Judith Furner Eastbourne, East Sussex • Re easing winter fuel costs (Report, 6 October), it would benefit everyone if the outrageous daily standing charges were reduced or on a sliding scale based on usage. I can’t be the only person whose standing charges each month are half or more than the energy used. Judith Pearson Sheffield Continue reading...