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- Major twister hits Oklahoma: Its speed, which largely determines the damage it causes, is still unknown
- Why a tornado forms: Tornadoes start with a thunderstorm. But they also require other ingredients, such as instability.
- A mind for math: A part of the brain associated with making memories may also predict success in learning math
DUPLICATION DIFFERENCE
View Larger Version | A burst of duplications happened in the genome of the common ancestor of humans and African great apes between 8 million and 12 million years ago. The numbers closest to the pictures indicate millions of duplicated bases that are unique to each species. For example, 13.6 million bases duplicated in the human genome are not duplicated in the genomes of the other species.
Credit: Marques-Bonet et al., Nature, Feb. 12, 2009
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