Key PointsEarly Earth's atmosphere contained carbon dioxide, methane, nitrogen and water vapor, but it was virtually devoid of free oxygen.The ...
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42 human body quirks that are fascinating and a little funny
Who knew our bodies could be so weird?
A new study suggests that aerobic respiration began hundreds of millions of years before oxygen became abundant in Earth’s ...
In “Why Do We Exist?” Hakeem Oluseyi explores how life may emerge to move energy through matter—and why Earth is the perfect ...
Cyanobacteria—ancient microbes that oxygenated Earth and made complex life possible—are still revealing surprises billions of ...
The bacterial flagellar motor is finally understood after 50 years. In its workings, columnist Natalie Wolchover finds the ...
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