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Timeline: The evolution of life - life - 14 July 2009 Read full article Continue reading page |1|2|3|4 There are all sorts of ways to reconstruct the history of life on Earth. Pinning down when specific events occurred is often tricky, though. For this, biologists depend mainly on dating the rocks in which fossils are found, and by looking at the "molecular clocks" in the DNA of living organisms. There are problems with each of these methods. Modern genetics allows scientists to measure how different species are from each other at a molecular level, and thus to estimate how much time has passed since a single lineage split into different species. These difficulties mean that the dates in the timeline should be taken as approximate. 3.8 billion years ago? This is our current "best guess" for the beginning of life on Earth. , and was probably based on RNA rather than DNA. At some point far back in time, a common ancestor gave rise to two main groups of life: bacteria and archaea. 3.5 billion years ago 3.46 billion years ago 3.4 billion years ago

Speed Race 'Wikipedia Game' | The Wiki Game Last Game ResultsToday's LeadersWeek's Leaders Loading Last Game Winners... Points Breakdown 1st: 1000pts 2nd: 500pts 3rd: 300pts 4th: 200pts 5th: 150pts 6th-10th: 100pts11th+: 50pts with clicks in s. No winners in last game #1 Guest4A086 with 8 clicks in 82s. #2 GuestEAA7F with 7 clicks in 103s. ChessBomb The Unofficial Stephen Jay Gould Archive Do Not Touch Free conservation biology textbook: Conservation Biology for All Oxford University Press makes conservation biology textbook by some of the world's most prominent ecologists and conservation biologists available as free download Conservation Biology for All provides cutting-edge but basic conservation science to a global readership. A series of authoritative chapters have been written by the top names in conservation biology with the principal aim of disseminating cutting-edge conservation knowledge as widely as possible. Important topics such as balancing conversion and human needs, climate change, conservation planning, designing and analyzing conservation research, ecosystem services, endangered species management, extinctions, fire, habitat loss, and invasive species are covered. The global biodiversity crisis is now unstoppable; what can be saved in the developing world will require an educated constituency in both the developing and developed world. Features "If a book could receive a standing ovation - this one is a candidate. About the Editors

Doctor Who's 50th Anniversary The Doctor Who doodle started life as a request from a huge fan at Google. It seemed daunting- 11 Doctor's, 50 years of adventures, countless enemies and time travel! But we loved the idea of science fiction, technology and fun coming together, so we set about creating a multiple level game. The game was always a simple premise- those dastardly Daleks have stolen the Google letters and we need Doctor Who to retrieve them. Artists don't make games, programmers do. Engineering Gurus - Rui Lopes, Corrie Scalisi, Mark Ivey Additional support - Doug Simpkinson, Jonathan Shneier All things D of 3 - Leon Hong Deity of rain, lava & lightning - Kevin Laughlin Additional game ideas - Gregory Capuano Sounds - The BBC, Tom Tabanao, Manuel Clement and Cody! We thank the BBC for trusting us and also helping us whenever needed.

Celebrating 50,000 Generations of the Long Term Lines Front row: Ryan Quick, Chris Strelloff, and Brian Baer Standing: Justin Meyer, Jeff Barrick, Christian Orlic, James Dittmar, RohanMaddamsetti, Caroline Turner, Brian Wade, Mike Wiser, Neerja Hajela, Richard Lenski, Devin Dobias In Back: Zachary Blount Drawn by Zachary Blount FPS-Man Check your security settings Connection issues are typically caused by security settings on your network or computer. Check that your firewall or router has port 5222 open and allowing traffic. If you are on a school or office network, you may need to contact your network administrator to make the necessary changes. Is your version of Flash current? Some old versions of Flash don't work well with our new chat application. Ad blockers and browser plug ins Ad blocker programs like AdBlock Plus, proxy software and a variety of other browser add-ons can prevent users from connecting to chat. Try again in a few minutes Sometimes the internet is just not happy. Did you lose an achievement? loading

rEvolution - online games for biology students rEvolution is a collection of online games, designed by the Centre for Applied Research in Educational Technologies (CARET) and departments of biological science at the University of Cambridge, to introduce and reinforce key concepts in biology, ecology and plant science. They might make enjoyable activities for your science students at the end of term, as a plenary, or for a STEM science club. What strategies do plants need to survive and reproduce - and how are they different for wild and cultivated plants? Play the game A fun way to remind students about the role of phloem and xylem in plants. Play the game This game looks at how plants have evolved seeds dispersed by the wind, and compares how easily different designs of seed can colonise a landscape. Play the game Before playing the seed dispersal game, you may want to try out the seed dispersal quiz. How do plants evolve to suit their surroundings? Play the game Race to direct grains of pollen into the eggs Play the game Play the game