Ukraine has asked Turkey to detain a Russian-flagged cargo ship it says is carrying Ukrainian wheat. The Russian-flagged cargo ship Zhibek Zholy is carrying 4,500 metric tons of Ukrainian grain taken from the Russian-occupied port of Berdyansk, Ukraine’s foreign ministry has charged, according to Reuters. The Ukrainian prosecutor general’s office …

Yemen Conflict parties extended April truce for two months, while negotiations over access to Taiz city remained central sticking point and divisions surfaced within govt. Warring parties 2 June renewed UN-mediated April truce for two months; truce – which is longest in effect since start of war in 2015 – …

It may seem like technology advances year after year, as if by magic. But behind every incremental improvement and breakthrough revolution is a team of scientists and engineers hard at work. UC Santa Barbara Professor Ben Mazin is developing precision optical sensors for telescopes and observatories. In a paper published …