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Konstantinos P. Giapis with his reactor that converts carbon dioxide to molecular oxygen. Credit: California Institute of Technology

Comet inspires chemistry for making breathable oxygen on Mars

Although plentiful in modern Earth’s atmosphere, molecular oxygen is extremely rare in space. Only trace amounts have been found elsewhere in our solar system...
When macrophages are deprived of oxygen

When macrophages are deprived of oxygen

Hypoxia, which occurs when cellular oxygen demand exceeds supply, is a common feature during inflammation associated with a bacterial infection. The reason for the...
Planets with oxygen don’t necessarily have life, study

Planets with oxygen don’t necessarily have life, study

While searching life in other solar systems far and beyond, scientists often consider that oxygen presence in planet atmosphere indicates the sign of life....
Cyanobacteria in a river

Oxygen could have been available to life as early as 3.5 billion years ago

Oxygen in the Earth's atmosphere is fundamental for complex types of life, which utilize it amid vigorous breath to make vitality. The levels of oxygen...
When insects such as this Meganeura monyi developed wings roughly 325 million years ago, the insect population exploded, Stanford researchers found. (Image credit: Alexandre Albore, Wikimedia Commons)

Insects took off when they evolved wings

The development of wings not just enabled old insects to leave noticeably the primary animals on Earth to take to the skies, yet in...