The study, led by biologists at Harvard University, found that the slugs build sac-like structures known as kleptosomes out of their own cells in which the chloroplasts are stashed. The kleptosomes ...

The slightly warmer temperatures around the middle of the Earth melted the top layers of ice to form meltwater ponds that hovered around 0°C. This stable, warmer temperature could have served as a ...

Modern-day environments in Antarctica contain ponds filled with life forms that closely resemble early multicellular ...