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 Features Grand delusionsFrom crop circles and alien abductions to faith healers, many secretly believe in strange phenomena - and it has more to do with human psychology than with reality.  Orangutans struggle as palm oil boomsWildlife corridors are desperately needed to link up hundreds of patches of habitat increasingly fragmented by palm oil plantations.  Death starsFirst detected by spy satellites, then reported as evidence of alien warfare and now held responsible for a mass extinction on Earth. What exactly are gamma-ray bursts?  Vines in the skyFarms of the future may be built right in the middle of metropolises and scrape the sky.  Unravelling the secret of ageingMore than 30 years after discovering an enzyme that prevents chromosomes from fraying, Elizabeth Blackburn is still unravelling the mystery of why our cells age.  Nature's clones: what twins have taught usIs it our experiences or our genes that make us who we are? Studying twins has revealed unexpected, and often unnerving, insights into the nature versus nurture debate.  10 wonders to visit before they disappearAs global warming sets in, some of the world's wonders may not wait around for you to experience them. Here are the top 10 places you need to visit before the climate changes.  Sweet victoryHe may shirk the limelight, but his mastery of reproductive science often throws Alan Trounson into the public eye. And while he's been wounded before, his time is at hand.  Origin of our speciesHuman intelligence and complex behaviour are far older than suspected. Yet our ancestors almost didn't make it. How did we overcome a tenuous African existence to populate the world?  The red meat footprintOur diets revolve around meat. But rumours abound that being vegetarian is better for the environment. Could there be some truth to it? We investigate the evidence.  Stairway to HeavenChile's vast and barren Atacama Desert was once plundered for its mineral riches. Today it's rich in a completely different kind of resource: telescopes.  It's a wrap for Hello From Earth25,880 messages were collected by the project from places as far flung as the Vatican City, Afghanistan and Antarctica. NASA beamed them towards Gliese 581d at noon today.  Carbon busters: 8 climate change solutionsAs carbon dioxide levels creep ever higher, scientists are working to put greenhouse gas in its place. We investigate carbon sequestration.  A new bottom lineWhat is the collective impact of 6.7 billion human beings on one planet? David Suzuki ponders the problem of exponential population growth.  Are we alone?There could be more than 200 extraterrestrial civilisations humming away in our galaxy right now. Cosmos wonders where they are. 
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