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NASA astronaut Don Pettit has just shared a beautiful shot of the Grand Canyon captured from the space station during his recent stay there.

I own a copy of Crams Urivaled Family World Atlas 1889. All of its pages are accounted for including the cover front and back. The binding is damaged. Edges of the cover are frayed. I'm interested in ...

Alzheimer's Disease (AD) poses many challenges to healthcare systems for elderly people in the world, for which an accurate diagnosis of AD is therefore a crucial task. Positron Emission Tomography ...