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Suppose Mercury had 5-to-3 spin-orbit coupling and that its sidereal period remained 88 days, as now. An observer sees the Sun directly overhead in the Mercurian sky and then observes again from the same location 88 days later. Where will the Sun be in the sky? (Mercury, like Earth, rotates toward the east.)
Exchange of Bodily Fluids
The transfer of bodily substances such as blood, saliva, semen, and vaginal fluids, often relevant in discussions of infectious disease transmission.
AIDS
Acquired Immune Deficiency Syndrome, a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV) affecting the immune system.
Airborne Molecules
Tiny particles or substances suspended in the air that can be inhaled or absorbed by organisms.
Immune System
The complex network of cells, tissues, and organs that work together to defend the body against attacks by foreign invaders, such as bacteria, viruses, and other pathogens.
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