Arriving

Menstrual periods are arriving earlier for younger generations, especially among racial minority and lower-income individuals

May 29, 2024

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The average age at menarche — the first menstrual period — has been decreasing among younger generations in the U.S.,…

The age of the solar sail is arriving sooner than expected

May 5, 2024

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NASA has launched the latest attempt to test solar sail propulsion technology. The Advanced Composite Solar Sail System (ACS3), consisting of a…