How can a sophisticated modern Jew integrate the pious promises of our tradition with the tragic and often painful reality of ...

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Update, Sept. 4: A judge in Philadelphia ruled on Sept. 4 that SEPTA must reverse cuts that were already in place and cannot make any more service reductions. Under the ruling, SEPTA is allowed to ...

加州大学圣克鲁兹分校的Stefano Profumo教授近日发表了两项新研究，探讨暗物质可能形成的不同方式。暗物质是科学界最难解的谜团之一，占据宇宙总物质的约80%。它的引力解释了为何星系可以保持稳定结构并以特定方式旋转。宇宙大尺度结构和宇宙微波背景的观测也都指向了暗物质的存在，但人们至今不清楚暗物质是什么粒子、又是如何诞生的。