Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.
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最后一步是“拼图”，即通过计算机将这些二维图像整合起来，重构出高精度的三维结构模型。这项技术的优势在于“原汁原味”——无需染色或强迫分子结晶，即便是脆弱的大分子也能自然“上镜”，并且可以拍摄到难以定型的柔性分子、细胞内部的精细构造以及病毒入侵等过程。
Мощный удар Израиля по Ирану попал на видео09:41