Its invisibility during much of the 20th century doesn't mean that women weren't boxing.
The question now is whether the document makes a difference or fades back into invisibility.
Moreover, there are several other difficulties that may prevent a device conferring total invisibility from being built.
Some of the spells in the books include invisibility, temporary invincibility and the ability to summon creatures.
However, an invisibility cloak designed to hide something from people who were looking for it would not work.
Probably one of the most fascinating areas of applied physics right now is in the area of invisibility cloaks.
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The approach offers a simpler, more scalable route to invisibility than prior approaches.
That work showed acoustic invisibility in a shallow layer of water, at ultrasound frequencies above those we can hear.
The invisibility of tidal power may have helped it beat offshore wind in the race to deliver juice to the grid.
Nevertheless, this kind of engineering of light and the paths it takes has in principle a great many applications besides invisibility.
We also saw our readers going wild over a real-life invisibility cloak that causes its wearer to vanish in plain sight.
Moreover, unlike other proposed invisibility cloaks, it does not require knowledge of what is behind the wearer, nor are crude projections involved.
Virtually all of the 100 objects they have chosen will be familiar to readers, some of them to the point of invisibility.
So we create that invisibility ourselves in our own unwillingness to discuss unpleasant issues or in our willingness to make light of them.
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Much research has been undertaken toward creating Harry Potter-style "invisibility cloaks" since the feasibility of the idea was first put forward in 2006.
This seeming paradox a building cloaked in invisibility and yet massively assertive has led certain British writers to regard Hawksmoor as an architect with occult powers.
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Researchers have trapped a rainbow - slowing light to a near-stop - in an array of 25, 000 "invisibility cloaks", each smaller than a hair's breadth.
This is the worst possible example we can set for our students: People are so used to receiving poor service that they expect disappointment and invisibility.
They grabbed the book, adhered to spoiler alerts, brewed a pot of coffee, donned their invisibility cloaks and gobbled up the entire book in a single sitting.
"This to our knowledge is the first cloak that really addresses getting the transformation exactly right to get you that perfect invisibility, " Prof Smith told BBC News.
Amazon won't say what it was up to, but given the invisibility of a Web attacker these days, buying new technology is one of the better defenses still available.
There are various possible explanations for their invisibility.
Invisibility was equivalent to safety for young Alex.
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Fresh on the heels of the microwave invisibility project at the University of Texas at Austin, French researchers have found a way to make a cloak that can hide a subject from thermal imaging devices.
ENGADGET: Researchers working on thermal cloak, Predators trill their disapproval
Invisibility can have its pluses, of course.
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The team's invisibility cloak exploits this effect, and relies on a specific geometry comprising two prism-shaped calcite crystals glued together, such that they leave a wedge-shaped gap beneath in which objects can be "cloaked" when illuminated with polarised light.
Although it doesn't quite have the wow factor of Cornell's invisibility project, the thermal research may prove to be more practical because it also can be used to manage heat and improve cooling in components such as computer chips.
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