यह रेल करती है रेल पटरी की पोलिश - कभी देखि है ऐसी जापान की रेल टेक्नोलॉजी
This train keeps the rail tracks polished. Amazing train maintenance technology used in modern times.
Category
Autos & Vehicles
Category
Autos & Vehicles
Science News Date: December 20, 2016 Source: Georgetown University Medical Center Summary: Sunlight, through a mechanism separate than vitamin D production, energizes T cells that play a central role in human immunity, researchers have found. The findings suggest how the skin, the body’s largest organ, stays alert to the many microbes that can nest there. Read full story: Sunlight offers surprise benefit: It energizes infection fighting T cells
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