The light-sensitive tissue of birds’ eyes is not supplied with oxygen by blood vessels – instead, it powers itself with a ...

Fingertip monitors known as pulse oximeters that can be used at home to detect low blood oxygen levels (hypoxaemia) give ...

Constant exhaustion is often dismissed as lifestyle-related, but experts warn it may signal vitamin B12 deficiency. This ...

These underground rodents are the first mammals found to actively choose air with lower-than-normal oxygen levels. Their ...

Reduced blood flow to the brain is thought to be a key factor in many forms of dementia, including Alzheimer's, and ...

Modern work routines often mean missed nutrition. Here's how five essential nutrients help sustain energy and mental clarity ...

Ozone that protects us from the sun's harmful UV rays, when in an indoor space, reacts with oils present on skin, wall paint, ...

Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

Prevention is key, and adopting a regimen of no smoking, minimal alcohol, a healthy, reduced-salt diet, low stress levels and ...

Placenta previa is a serious condition during pregnancy in which the placenta sits very low in the uterus. Its location may cover the cervix fully or partially. This condition may cause bleeding and ...