Он-лайн телескоп (выборочная регистрация, необходимо указать цели использования телескопа)
Интересная шкала размеров
Здесь сравнивается размер объектов, начиная с микроуровня и заканчивая целыми планетами и даже звездами. По каждому — дана небольшая, но интересная справка.
Мировая статистика - ресурс отображает в реальном времени множество данных.
Слово за слово, а человечество уже вплотную подкатилось к созданию боевых человекоподобных роботов, а значит стоит задуматься о законах робототехники. Азимовские три закона явно не подходят - зачем военным роботы, которые не могут причинять вред? Потому американская военщина ведет собственные изыскания и вот даже выпустила книжку со скромным заголовком:
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