Short answers, pulled from the story.
The earliest known permanent settlement in Orkney is Knap of Howar on Papa Westray, a Neolithic farmstead dating from 3500 BC. The village of Skara Brae, Europe's best-preserved Neolithic settlement, is believed to have been inhabited from around 3100 BC. A charred hazelnut shell found during excavations in Tankerness in 2007 indicates the presence of Mesolithic nomads as far back as 6820-6660 BC.
Orkney was absorbed into the Kingdom of Scotland in 1472 by the Parliament of Scotland. The transfer followed the failure of Christian I of Norway to pay the dowry promised when his daughter Margaret married James III of Scotland; the islands had been pledged as security in 1468.
After the Armistice in 1918, the entire German High Seas Fleet was transferred to Scapa Flow to await a decision on its fate under the peace negotiations. The German sailors scuttled all the ships by opening the seacocks. Most vessels were subsequently salvaged, but the remaining wrecks are today a destination for recreational divers.
By 2015 Orkney was generating over 100% of its net electricity demand from renewable sources, mainly wind turbines. The European Marine Energy Centre operates the world's first purpose-built wave and tidal energy testing facility on the islands, with sites at Billia Croo and in the Fall of Warness off Eday. Orkney has also pioneered the conversion of surplus renewable electricity into hydrogen for vehicles, heating, and potential ferry propulsion.
The Heart of Neolithic Orkney is a UNESCO World Heritage Site inscribed in 1999. It encompasses a group of approximately 5,000-year-old sites on the Orkney Mainland, including the preserved village of Skara Brae, the Ring of Brodgar stone circle, the Standing Stones of Stenness, and the Maeshowe passage grave.
The shortest scheduled air service in the world operates between the Orkney islands of Westray and Papa Westray, with a scheduled duration of two minutes. The route is operated by Loganair and serves communities that would otherwise rely on ferry connections.