Hidden water holds the key to a changing desert

Passover, which celebrates the Israelites' flight from Egypt, ended Tuesday night. Yet after the exodus, they wandered the desert for 40 more years. There, Moses struck a rock with his staff and made water flow.

Study first to show evolution's impact on ecosystems

Scientists have come to agree that different environments impact the evolution of new species. Now experiments conducted at the University of British Columbia are showing for the first time that the reverse is also true.

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