It's an age-old question: How much money do you need to be considered super-wealthy? A new landmark report on the rise of the centi-millionaire reveals that although a handful of the world's billionaires, such as Elon Musk, Mark Zuckerberg, Jeff Bezos, Roman Abramovich and Bill Gates dominate the news headlines, their wealth cohort is outnumbered nearly 10-to-1 by a fast-growing global elite of highly influential super-wealthy movers and shakers who boast US$100 million or more in investible assets.

A brutal summer has caused havoc for many in rural Spain, but one unexpected side-effect of the country's worst drought in decades has delighted archaeologists - the emergence of a prehistoric stone circle in a dam whose waterline has receded.