National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

This refers to restating or rephrasing the question or prompt in your own words to ensure that you understand it correctly. Provide a clear and concise answer to the question or prompt. This is the ...

A photograph of a handmade mosaic shows a human brain emerging from multiple distinct stem cell lineages. The tiles represent, in color tone gradients, the cell types developing from the stem cells of ...