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In a new study, researchers carried out the most extensive coordinated comparison of optical clocks to date by operating clocks and the links connecting them simultaneously across six countries. Spanning thousands of kilometers, the experiment represents a significant step toward redefining the second and ultimately establishing a global optical time scale.

Use of common psychiatric medications (anxiolytics, hypnotics and sedatives, and antidepressants) is linked to a higher risk of developing amyotrophic lateral sclerosis (ALS), and poorer outcomes after diagnosis with shorter survival and faster functional decline, according to a nationwide Swedish study led by Karolinska Institutet