January 5, 2026 • D.C. police officers experienced some of the most intense violence during the attack on the U.S. Capitol on Jan. 6, 2021. We sat down with two of them to rewatch their body camera ...

IN an earlier paper1, we have described a new type of interferometer which has been used to measure the angular diameter of radio stars2. In this instrument the signals from two aerials Ax and A2 (Fig ...