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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Percutaneous transluminal balloon valvuloplasty Percutaneous transluminal balloon valvuloplasty
Demonstration of the function of a balloon-tipped catheter during a PTCA procedure. Demonstration of the function of a balloon-tipped catheter during a PTCA procedure.
Hot Air Balloon Physics Hot Air Balloon Physics
Balloon angioplasty. Balloon angioplasty.
A balloon filled with helium gas at 20°C occupies 2.91 L at 1.00 atm. The balloon is immersed ... A balloon filled with helium gas at 20°C occupies 2.91 L at 1.00 atm. The balloon is immersed ...
Intraaortic balloon pump. The balloon deflates during systole, so cardiac output is unimpeded. Intraaortic balloon pump. The balloon deflates during systole, so cardiac output is unimpeded.
Video: ribosome

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