Kai Havertz has endured an underwhelming season since moving to Chelsea in a £72million transfer last summer, but Thomas Tuchel has identified the ideal role for his compatriot
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World
Fish passes can reconnect species with habitats blocked by dams – here’s how they work
Over one million dams and culverts (tunnels that encircle rivers passing under roads) block the movements of fish and other wildlife in Europe. Scientists estimate…