Welcome to Science in action from the b.b.c. World Service with me Roland piece in a moment we ll be heading to Nepal for hints on how to best survive the thin mountain air on the flanks of Everest probably the most fascinating group of the Sherpas to be living at altitude for some sense of years so it seems a very engine is burning a more efficient fuel our this is a walk to the high octane That s right remember it s also bye bye to the little sticky label that comes on each item of fruit at the shops the new alternative is branding literally with a laser powered fruity to 2 we hear how it works and we go on a porpoise patrol in the Gulf of California to protect one of the most endangered species on the planet php. Those 100 percent possibly they re going to die if they stay in the water. The clicks of a key to porpoises which a special project should keep echoing through the Mexican waters about a year ago 11 months to be more precise and that s as Juno mission arrived at Jupiter af