Some Chinese and Singaporean scientists have developed a cloaking device made up of sheets of glass that make the things behind them "disappear" from the sight of the people who view them face-on.
They tested the system on a cat and on a fish -- not at the same time, as the cat would definitely have made the fish disappear as soon as someone's back was turned. The whole apparatus is not necessarily portable, which means you are invisible only when you're in a certain spot, and which seems to me to be of limited utility. You can see the effect on videos at the link.
This is not the same thing as certain people appearing at certain times so suddenly as to make it appear that they were previously invisible, i.e., teenage boys when the refrigerator opens, officials at the college where I used to work when my church's checkbook opens, and so on.
It is also, apparently, not responsible for the widespread presence of empty suits occupying political offices at many levels. Those would be the fault of the people who voted for them.
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