A schoolboy has discovered what appears to be an extremely rare fossil of footprints from more than 300 million years ago.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/C...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/C...



Tendencias Científicas
La prevención del VIH no llega a las jóvenes sudafricanas

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