How close to invisible can a mirror be? + 5 physics ideas that need to die

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How close to invisible can a mirror be?
https://phys.org/news/2017-10-invisible-mirror.html

EXCERPT: In 2011, mathematicians Alexander Plakhov and Vera Roshchina proved that objects with mirror surfaces cannot be perfectly invisible. Now in a new study, Plakhov has returned to the problem, asking just how close to invisible a mirror-surfaced object can be. [...] The question of the invisibility of mirror-surfaced objects is not just a mathematical curiosity, but it also has potential practical applications. For instance, mirrors are much cheaper and easier to fabricate than metamaterials, which are currently being investigated for their invisibility properties. The ability to create the effect of invisibility—especially when viewed from multiple directions—has a wide variety of potential uses, including military applications (hiding submarines and aircraft), medical imaging (cloaking internal organs that are blocking an area of interest), and improving the performance of small-scale electronics devices by carefully controlling the flow of light and heat....

MORE: https://phys.org/news/2017-10-invisible-mirror.html



Five Brilliant Ideas For New Physics That Need To Die, Already
https://www.forbes.com/sites/startswitha...24a44a57b7

EXCERPT: [...] But when the data comes in, it's important to let those invalid ideas go. Hanging on to them only slows down the progress of science, forcing a field to fight a continuing battle whose outcome has already been settled. Unfortunately, as unbiased and objective as science itself may be, the scientists doing it are not. They fall in love with ideas, and when the data shows that they are bad ideas for describing the actual, physical Universe, it does not lead them to change their minds. It is the very reasoning that led Max Planck to quip:

“A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.”

With that in mind, here are five brilliant ideas for new physics that have been very popular since the 1980s that continue to be popular today. But based on the evidence, it's long past time for them to die....

MORE: https://www.forbes.com/sites/startswitha...24a44a57b7
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