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Max Pearson presents a collection of this week\u2019s Witness History episodes from the BBC World Service.

It has been 50 years since Abba won the 1974 Eurovision Song Contest, so we're exploring Swedish history.\n \nAlso in 1974, Sweden became the first country in the world to offer paid parental leave that was gender neutral. One father who took the leave tells us about this pioneering policy.\n \nWe hear from one of the inventors of Bluetooth. The technology was named after Harald Bluetooth, a Viking king.\n \nOur expert guest is Eva Krutmeijer, Swedish science writer and co-author of the book ' Innovation, the Swedish Way\u2019.

Plus, the invention of the three-point safety belt for cars, that is estimated to have saved more than one million lives around the world, and the story behind Sweden\u2019s Cinnamon Bun Day.\n \nFinally, 1974 was just the beginning for the Swedish quartet, Abba, who shared their name with a herring company. By the end of the decade, they were one of most recognisable music acts of the 20th century. \n \n \n \nContributors:\nPer Edlund - one of the first fathers in his town to take split paid parental leave\nSven Mattison - one of the inventors of Bluetooth\nEva Krutmeijer - Swedish science writer and co-author of the book 'Innovation, the Swedish Way'\nGunnar Ornmark - stepson of Nils Bohlin who invented the three-point safety belt for cars\nKaeth Gardestedt - who came up with the idea of Sweden's Cinnamon Bun Day\nG\xf6rel Hanser - manager of Abba\n \n(Photo: Abba in 1974. Credit: Anwar Hussein/Getty Images)