Space travel might be a touch stressful on the human body, Nature News says. Preliminary results from the NASA Twins Study have found differences in DNA methylation and gene expression in samples collected from astronaut Scott Kelly.

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Bloomberg reports that Brainstorm Cell Therapeutics plans to offer a treatment it is developing under the "right to try" law for hundreds of thousands of dollars.

In Nature this week: expansion of disease-resistance genes among long-lived oak trees, and more.

In a proof-of-concept study, researchers report being able to determine age from dried bloodstains, Discover's D-brief blog reports.

A new report highlights the potential threats posed by advances in synthetic biology, NPR reports.