Where some noises — like TV, traffic and random conversations — can make it hard to concentrate, birdsong may make it easier. In Alder Hey Children’s Hospital in Liverpool, England, the sweet sounds of birdsong carry along the hallways. In an Amsterdam airport, a lounge plays bird sounds to help travelers relax before flights. One expert thinks that birdsong relaxes people physically while stimulating them cognitively — the body relaxes while the mind becomes alert. Learn more at BirdNote.org.