A fish-eye lens view of Dubai's skyline as seen from the Burj Khalifa, the world's tallest building at 828 metres. AFP

From Dubai by fish-eye to a whale stranded in the Thames - Monday's best pictures



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What is a Ponzi scheme?

A fraudulent investment operation where the scammer provides fake reports and generates returns for old investors through money paid by new investors, rather than through ligitimate business activities.