The QWERTY keyboard layout, still standard today, was originally designed in the 1870s for typewriters with what primary (and now 'useless') purpose?
Which key on a standard computer keyboard, often placed near 'Print Screen' and 'Pause Break', has almost no practical function in modern operating systems and software?
The human coccyx, or tailbone, is considered a vestigial structure, representing the evolutionary remnant of what?
In fiction, what is a 'MacGuffin'? It's a plot device, often an object or goal, that is vitally important to the characters and drives the story, but whose actual nature or identity is ultimately unimportant or irrelevant to the audience.
What common visual icon, used universally to represent saving a digital file, depicts an obsolete storage medium that is rarely used today?
Which now-disproven scientific theory proposed the existence of a fire-like element that was released during combustion, making it a 'useless' explanation for burning?
What hypothetical, undetectable medium was once believed to permeate all of space, allowing light waves to propagate, but was disproven by the Michelson-Morley experiment and made 'useless' by Einstein's theory of relativity?
What was the primary, ultimately 'useless' goal of alchemy, the ancient practice that was a precursor to modern chemistry?
In Greek mythology, what eternally 'useless' task was Sisyphus condemned to perform, pushing a boulder up a hill only for it to roll back down each time?
Which obscure legal term refers to the perpetual ownership of land by institutions (like churches) preventing it from being sold or inherited, a practice rendered largely 'useless' by modern property laws?