The new technique uses light to activate a compound in iridium to kill cancer cells, even when they've got an advantageous lack of oxygen.

A new measurement of "Earth's heartbeat," the dynamic between oxygen and the productivity on Earth, shows animals can regulate the planet's oxygen levels.

Around 2 billion years ago, there was a mass die-off of microbes. Researchers say it rivals the loss of life from the dinosaurs' extinction.

Microparticles can monitor oxygen levels in hydrogels that one day could be used to regrow muscle, cartilage, or organs.

"...it just shows how much is still out there in the ocean that we don't know."

Scientists have discovered the lightest-ever version of oxygen, with only three neutrons to its eight protons.

Mitochondria join together to help cells to multiply in unexpected ways, finds research with potential relevance to cancer.

New research debunks the conventional wisdom that oxygen and organic compounds in the atmosphere are strong evidence of alien life.