Donald Trump has spent much of his second term at war with science and scientists. He is cutting staff at institutions such as the Environmental Protection Agency (EPA) by a third, and has cancelled or frozen up to 8,000 federal research grants. This hasn’t just hurt individual research programmes, it has damaged America’s credibility as a reliable partner in the scientific community. It is not surprising that many researchers – one poll last year by the journal Nature gave the number of 75% – say they are considering leaving the US entirely.
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A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
Авианосцы Военно-морских сил (ВМС) США, которые в прошлых операциях практически не сталкивались с рисками, могут стать целью в случае возможного конфликта с Россией или КНР. Потенциальную угрозу для американских авианесущих кораблей оценил обозреватель 19FortyFive Харрисон Касс.
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