A variation on the grandfather paradox … is the Hitler paradox. In this one you travel back in time to murder Hitler before he starts the Second World War, thus saving millions of lives. But if you murder Hitler in, say, 1938, then the Second World War will never come about and you will have no reason to travel back in time to murder Hitler!
— J.H. Brennan, Time Travel: A New Perspective, 1997
In 1963, French geologist Michel Siffre descended into a glaciated cavern under the French-Italian Maritime Alps and spent more than two months without sun to “investigate time, that most inapprehensible and irreversible thing.” He could telephone scientists on the surface, who recorded the time of each call, but they never told him the time or date. From his diary:
Forty-second awakening. … I really seem to have no least idea of the passage of time. This morning, as an example, after telephoning to the surface and talking for a while, I wondered afterward how long the telephone conversation had lasted, and could not even hazard a guess. … Fifty-second awakening. … I am losing all notion of time. … When, for instance, I telephone the surface and indicate what time I think it is, thinking that only an hour has elapsed between my waking up and eating breakfast, it may well be that four or five hours have elapsed. And here is something hard to explain: the main thing, I believe, is the idea of time that I have at the very moment of telephoning. If I called an hour earlier, I would still have stated the same figure. … I am having great difficulty to recall what I have done today. It costs me a real intellectual effort to recall such things.
The outsiders could see that his waking and sleeping remained near a cycle of 24.5 hours, but Siffre’s conscious understanding of time was greatly affected. Misunderstanding the length of his day, he began to husband his rations, thinking he had weeks more to endure. At his 57th awakening, the final day of the experiment, he thought it was August 20; in fact it was September 14. “I underestimated by almost half the length of my working or waking hours; a ‘day’ that I estimated at seven hours actually lasted on the average fourteen hours and forty minutes.” NASA has pursued these inquiries to consider the implications for space travelers.
(From Jane Brox, Brilliant: The Evolution of Artificial Light, 2010.)
In 2006, Canadian blogger Kyle MacDonald traded this red paper clip for a fish-shaped pen. Then, in successive transactions, he bartered his way up to a hand-sculpted doorknob; a Coleman camp stove; a Honda generator; an empty keg with an IOU for beer; a snowmobile; a two-person trip to Yahk, British Columbia; a box truck; a recording contract; a year’s rent in Phoenix, Arizona; an afternoon with Alice Cooper; a motorized KISS snow globe; a role in the film Donna on Demand; and a two-story farmhouse in Kipling, Saskatchewan.
“A lot of people have been asking how I’ve stirred up so much publicity around the project,” he told the BBC, “and my simple answer is: ‘I have no idea.'”
An angel appears to a conference of philosophers and offers to provide the truthful answer to a single question. Cannily they ask:
“What is the ordered pair whose first member is the question that would be the best one for us to ask you, and whose second member is the answer to that question?”
Truthfully the angel answers:
“It is the ordered pair whose first member is the question you just asked me, and whose second member is this answer I am giving you.”
Philosopher Ned Markosian writes, “At the time the philosophers asked [the question above], it seemed like that question was the ideal one for their peculiar situation. But as it turned out, [that question] was obviously not at all the right thing to ask. … The puzzle, then, is this: What went wrong?”
In September 2008, Mike Nolan, head of web services at Edge Hill University in Ormskirk, England, noticed something strange on Google Maps. “I grew up in the area and spotted on the map one day that it said ‘Argleton’,” he told the Guardian. “But it’s just a farmer’s field close to the village hall and playing fields. I think a footpath goes across the field, but that’s all.”
Bloggers began to discuss the nonexistent town, which found its way into other services that used Google’s data: Employment agencies, weather services, and letting agents began to cite Argleton in their listings, reassigning real people and businesses to the phantom settlement because of its claimed location.
Was it a joke? A placeholder? A misspelling? Whatever it was, it had disappeared again by May 2010. Google would say only that it experiences “occasional errors” and that it gets its mapping information from a Dutch company called Tele Atlas (whose spokesperson would add only, “I really can’t explain why these anomalies get into our database”).
Danny Dorling, president of the Society of Cartographers, said, “I would bet that this is an innocent mistake. In other words, it was not intentionally inserted to catch out anyone infringing the map’s copyright, as some are saying. But the bottom line is that we don’t know what mapping companies do to protect their maps or to hide secret locations, as some are obligated to do.”
In 1829, engineer J.W. Hoar built a cable railway up the side of Ladder Hill in Jamestown, Saint Helena, in the South Atlantic, to carry cargo up the 40-degree incline to Ladder Hill Fort. After 40 years, termite damage forced the closure of the railway, but the associated staircase remains open to intrepid tourists.
The fastest recorded ascent to date was made by Scotland’s Graham Doig in 2013. He climbed the 699 steps in 5 minutes 16.78 seconds.