Mouse embryo cells undergo apical-basal polarization asynchronously at the 8-cell stage, and the timing of polarization influences subsequent lineage allocation.

A rare stratospheric warming event high above the Arctic could disrupt the polar vortex and send colder air toward Texas in ...

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

Political systems become polarized when internal unity within groups strengthens and the divide between them deepens. As polarization intensifies, societal tensions can grow, making it difficult to ...

Another arctic blast is on the move toward the U.S., bringing the potential for bitter cold and heavy snow accumulations to ...

An extreme warming event high in the atmosphere is threatening to disrupt the polar vortex. We break down what that could mean for Canadians A rare, early, stratospheric warming event could shake up ...

High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

In a single year, one polar bear can leave roughly 300 kilograms of prey for other animals to dine on. Altogether, the carnivores provide 7.6 million kilograms of carrion for scavengers throughout the ...

With high-profile political prosecutions and deepening polarization dividing the country, legal experts and former Justice Department officials told NBC News they fear the United States has entered a ...

In an early sign of the winter weather that's coming, the dreaded polar vortex is making news yet again. The polar vortex is "ramping up from its summer slumber," said meteorologist Judah Cohen in an ...