Artificial islands may seem a modern invention better associated with Dubai and China, but in Scotland, humans have been building them for thousands of years.It turns out one such 'crannog' in Loch Bhorgastail on the Isle of Lewis was first constructed more than 5,000 years ago, meaning it was built by prehistoric humans during the Late Neolithic. Using new technology, scientists have now discovered the wooden and stone foundations that established the Loch Bhorgastail crannog many millennia ago. "Crannogs are small artificial islands that are typically thousands of years old," explains archaeologist Stephanie Blankshein, from the University of Southampton in…