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Whether it’s loud trucks, planes taking off or rattling freight trains: Noise makes people sick. But there are innovative solutions to reduce noise. This documentary presents some of them. So-called "crossbars" are a great relief for many residents of noisy cities. These are new buildings that close gaps between rows of houses to keep street noise out. In the Middle Rhine Valley, as many as 600 trains thunder over the tracks in a given day. In recent years, so-called whisper brakes have been installed on many rail cars to reduce rail noise. But for local residents, it’s not enough. They are calling for further "quiet” measures. The start-up "recalm" wants to use "antisound" to reduce noise in mining vehicles. Until now, drivers had the roar and hum of the machines in their ears for eight hours a day, all but guaranteeing hearing loss. With the new high-tech system, low frequencies are reduced, leading to 50% less noise. Owls are silent. That’s why they are the perfect model for Professor Jan Werner Delfs of the German Aerospace Center (DLR) in Braunschweig. Along with a colleague, the acoustics expert and aerodynamics engineer is researching the art of silent flight - and thus the possibility of making aircraft fly more quietly. ______ DW Documentary gives you knowledge beyond the headlines. Watch top documentaries from German broadcasters and international production companies. Meet intriguing people, travel to distant lands, get a look behind the complexities of daily life and build a deeper understanding of current affairs and global events. Subscribe and explore the world around you with DW Documentary. Subscribe to: ⮞ DW Documentary (English): https://www.youtube.com/dwdocumentary ⮞ DW Documental (Spanish): https://www.youtube.com/dwdocumental ⮞ DW Documentary وثائقية دي دبليو (Arabic): https://www.youtube.com/dwdocarabia ⮞ DW Doku (German): https://www.youtube.com/dwdoku ⮞ DW Documentary हिन्दी (Hindi): https://www.youtube.com/dwdochindi For more visit: https://www.dw.com/en/docfilm/program-294010 Follow DW Documentary on Instagram: https://www.facebook.com/unsupportedbrowser Follow DW Documental on Facebook: https://www.facebook.com/unsupportedbrowser We kindly ask viewers to read and stick to the DW netiquette policy on our channel: https://www.dw.com/en/dw-netiquette-policy/a-5300954