Papua New Guinea speak twice as many as the whole of Europe. though it has a population of just 10 million. The speakers of just 23 languages account for half the global population. Speaking a second - or third - language can help you stand out in the labour market. Research also shows multilingual people are better at problem-solving and can be more empathetic and creative. However, half of all languages are endangered and 1,500 could die out by 2100. At UCL, scientists are 3D-printing models of endangered languages, visualizing sound patterns and grammar as a way to preserve them.