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| It's in the genes: Research pinpoints how plants know when to flower Posted: 26 May 2012 04:12 PM PDT Scientists believe they've pinpointed the last crucial piece of the 80-year-old puzzle of how plants "know" when to flower.  |
| Maya collapse: Trade patterns for crucial substance played key role Posted: 23 May 2012 10:55 AM PDT Shifts in exchange patterns provide a new perspective on the fall of inland Maya centers in Mesoamerica approximately 1,000 years ago. This major historical process is sometimes referred to as the "Maya collapse."  |
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