Fast-moving invisibility cloaks become visible

(—Physicists have found that invisibility cloaks that can achieve perfect invisibility when not in motion will become visible when moving at speeds of around thousands of meters per second. This is because invisibility ...

Optical metacage blocks light from entering or escaping

(—Physicists have built a nanowire cage that blocks one or more wavelengths of light from either entering or escaping, yet allows liquids and gases to pass through the small gaps between the nanowires. The "optical ...

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Magical objects in Harry Potter

The following is a list of magical objects in Harry Potter. These objects exist for the use of the characters in the series by J. K. Rowling.

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