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Space–time invisibility cloak could 'edit history'（图）
Space–time invisibility cloak 'edit history'
2010/11/30
Physicists in the UK have proposed a "space–time" invisibility cloak that, if built, could be used to prevent signal interference or give the illusion of a Star Trek teleportation device. The idea com...
Ever since the solar system formed roughly five billion years ago, a steady barrage of asteroids, comets and other rocky material has pummeled the surfaces of planetary bodies. Earth’s surface shows l...
The Iberoamerican Contribution to International Time Keeping
International Time Keeping Iberoamerican
2009/6/26
The Iberoamerican Contribution to International Time Keeping。