A resident of Sioux Falls, South Dakota, recently spotted an albino squirrel hanging out in a tree near the Prairie Green Golf Course. Sioux Falls Parks and Recreation officials announced the ...

“Faster than a speeding bullet” may bring to mind a certain superhero from the planet Krypton, but it was literally true of the SR-71 Blackbird, the sleek, stealthy Air Force spy plane taken ...

Can all living things—plants, insects and bacteria—be albino? Lilliana Hitchcock, Houston, Texas If by “albino” you mean an organism lacking the pigment melanin, then loosely speaking ...

A PaO2 test measures partial pressure of oxygen, or PaO2—the oxygen pressure in arterial blood. The PaO2 reflects how well oxygen is able to move from the lungs to the blood. It is often altered by ...