Earth Beat, 6 April 2012. Things that are going places - from rubber duckies sailing the ocean seas for a couple of decades, to the world’s most gruelling marathon and the first man to walk around the world, we’ll take you places you’ve never been.
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Dubbed the hardest race to run in the world - the Barkley Marathons live up to their name. The 100-mile course on an unmarked track through a Tennessee state park takes runners across streams and up mountains – and temperatures on the weekend that the Barkley is held fluctuate so much they can threaten heatstroke and hypothermia.
Web extra - Barkley marathon founder Gary Cantrell explains how it differs from a normal race - listen in new player
Green flight - listen in new player
Mike Voorhees is the founding CEO of Skylite Aeronautics – a green airship that can carry the equivalent of ten Boeing 747 planes' worth of cargo, but costs just the equivalent of one 747 to make.
It hasn't been built yet, but Mike joins Marnie from a studio in Colorado to bring the drawing board to life. View photos.
Moby-Duck - listen in new player
What we get out of going places - listen in new player
Everyone on the Earth Beat team is really well-travelled.
Walking round the world - listen in new player
Whoever came up with the phrase "It’s a small world" had obviously never walked around it.
Dave Kunst was 30 when he set off with his brother John on a mission to circumnavigate the globe on foot.
More - Earthwalker website
Graphic: Dave Kunst's route (rollover points for key stages)
The Beat of Kenya - click for more information
We're looking for input from listeners for our Beat of Kenya promotion on Facebook. Can you represent Kenya with an audio or video upload? Music, dance, spoken word - whatever you do best, we want to see your originality and talent.