Even if a peace can be reached, it won’t be easy to solve the problem of Ukrainian civilians languishing in Russian jails. This is one prisoner’s story. By Jeffrey Gettleman Segev Kalfon said he ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. On Nov. 28, 1967, astronomers found the first pulsar. A pulsar is a super-dense star that rotates ...

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