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In Israel, air raid sirens spark anxiety and dilemmas

Acutely sensitive to noise because of childhood trauma, Nili stresses when air raid sirens send her into a crowded shelter where her own "internal war" overlaps with the one raging outside. The experience of Nili, whose name has been changed for this article, highlights the

Quadratic gravity theory reshapes quantum view of Big Bang

Waterloo scientists have developed a new way to understand how the universe began, and it could change what we know about the Big Bang and the earliest moments of cosmic history. Their work suggests that the universe's rapid early expansion could have arisen naturally from a

Black hole mergers test the limits of general relativity

General relativity stands as one of the bedrock theories in modern physics. Its strange view of relative time and space has been confirmed by countless experimental and observational tests, from rotational frame dragging to the radiation of gravitational waves. But there is