Pulse oximeters use light to measure how much oxygen is in a person’s blood. For most people, a normal pulse oximeter reading is between 95% and 100%, researchers said in background notes. Readings ...

Neural tissue normally dies quickly without oxygen. Yet bird retinas—among the most energy-demanding tissues in the animal ...

The discovery fundamentally changes the understanding of a structure in the avian eye that has been misinterpreted for centuries.

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

"What is good for the heart is good for the brain," one researcher says.

Bird retinas survive without oxygen by burning sugar scientists solve 300 year mystery that could help treat human strokes.

A Chinese-Swedish research team has boosted the performance of tin-lead perovskite solar cells by modifying additives and post-treatment processes. The device also demonstrated improved stability, ...

Numerous studies have shown COVID infection ups the risk of heart problems, including heart attacks, strokes, damage to the ...

A new study explains why current brain theories fail to fully explain near-death experiences and consciousness.

For Shi, a Shaanxi Normal University graduate who has taught English at Lhasa Middle School for nearly 14 years, this ...

When you’re short on sleep and your focus suddenly drifts, your brain may be briefly slipping into cleanup mode. Scientists ...