ScienceDaily: Top Environment News

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• It's in the genes: Research pinpoints how plants know when to flower
• Why humans don't smell as well as other mammals: No new neurons in the human olfactory bulb
• Maya collapse: Trade patterns for crucial substance played key role

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.

Why humans don't smell as well as other mammals: No new neurons in the human olfactory bulb Posted: 24 May 2012 06:22 AM PDT The human olfactory bulb – a structure in the brain that processes sensory input from the nose – differs from that of other mammals in that no new neurons are formed in this area after birth. The discovery is based on the age-determination of the cells using the carbon-14 method, and might explain why the human sense of smell is normally much worse than that of other animals.

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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