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A short guide to how compound interest can help money grow over time.

This episode explores "planet earth's final frontier": the world of caves. At a depth of 400 metres, Mexico's Cave of Swallows is Earth's deepest pit cave freefall drop, allowing entry by skydivers. Its volume could contain New York City's Empire State Building. Mexico's Cueva de Villa Luz is also featured, with its flowing stream of sulphuric acid and snottite formations made of living bacteria. A fish species, the Shortfin Molly (Poecilia mexicana), has adapted to this habitat.

An abandoned rhinoceros calf finds an unlikely friend in a warthog when it is reared in an animal sanctuary. Wild animals in the African desert fight for survival. Free amazing wildlife and nature photography from BBC Worldwide.

Global warming could do more than just melt polar ice. It could change our maps, and displace people from cities and tropical islands.

Rex Harrison reprises his signature stage role of Henry Higgins, the supremely assured phoneticist who wagers that under his tutelage, cockney flower girl Eliza Doolittle can pass for a duchess at the Embassy Ball. In one of her best-loved roles, Audrey Hepburn plays Eliza. If ever there was a face the professor could grow accustomed to, it's hers. In Hartford, Heresford, Hampshire (and elsewhere) no one's fairer than My Fair Lady, one of the most irresistible musical ever.

The Open Universitys researcher in volcanoes, Hazel Rymer explains why the Poás volcano in Costa Rica is her favourite, and how evidence from previous experiments there has led her to believe there may be an environmental crisis - similar to one in the 1990's - on it's way. Hazel has a new method for detecting changes in the areas around volcanoes which might aid early prediction of activity.

The Open Universitys researcher in volcanoes, Hazel Rymer explains why the Poás volcano in Costa Rica is her favourite, and how evidence from previous experiments there has led her to believe there may be an environmental crisis - similar to one in the 1990's - on it's way. Hazel has a new method for detecting changes in the areas around volcanoes which might aid early prediction of activity.

Rex Harrison reprises his signature stage role of Henry Higgins, the supremely assured phoneticist who wagers that under his tutelage, cockney flower girl Eliza Doolittle can pass for a duchess at the Embassy Ball. In one of her best-loved roles, Audrey Hepburn plays Eliza. If ever there was a face the professor could grow accustomed to, it's hers. In Hartford, Heresford, Hampshire (and elsewhere) no one's fairer than My Fair Lady, one of the most irresistible musical ever.

Global warming could do more than just melt polar ice. It could change our maps, and displace people from cities and tropical islands.

An abandoned rhinoceros calf finds an unlikely friend in a warthog when it is reared in an animal sanctuary. Wild animals in the African desert fight for survival. Free amazing wildlife and nature photography from BBC Worldwide.

This episode explores "planet earth's final frontier": the world of caves. At a depth of 400 metres, Mexico's Cave of Swallows is Earth's deepest pit cave freefall drop, allowing entry by skydivers. Its volume could contain New York City's Empire State Building. Mexico's Cueva de Villa Luz is also featured, with its flowing stream of sulphuric acid and snottite formations made of living bacteria. A fish species, the Shortfin Molly (Poecilia mexicana), has adapted to this habitat.