The best AI chatbots of 2026: I tested ChatGPT, Copilot, and others to find the top tools around ...

Abstract: A novel two-dimensional sum-difference network (TDSDN) based on branch line coupler and 90° phase shifter is proposed in this paper, which overcomes the shortcomings of traditional ...

A quietly revolutionary account of cohabiting captured a nation’s heart – but what does it mean for the rest of the world? When Sunwoo and Hana met on Twitter, they were in their 40s and committed ...