Study shows the power of 'thank you' for couples

Gratitude has been a trendy sentiment in recent years—sparking an industry of journals, knickknacks and T-shirts touting thankfulness as a positive force in individuals' lives.

Report says native fish overlooked as invaders in US waters

Rivers split across mountaintops and other geographic barriers may flow only a few miles from one another, but to the aquatic creatures in those waters, the separation could represent millions of years of evolutionary time. ...

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