Nitrogen boundaries exceeded in many world regions

It has long been known that humanity is exceeding planetary boundaries for nitrogen use. Scientists have now mapped those exceedances regionally for the first time. Whereas countries in north-western Europe and parts of India ...

Iron snow ebb and flow may cause magnetic fields to come and go

Just as snow crystals form in the upper atmosphere, then fall to lower, warmer elevations and melt, scientists believe a phenomenon called iron snow happens in the molten iron cores of some planetary bodies. Cooling near ...

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