The rocks that sail across a desert, the vegetable you cannot bet on, and a race run with a person on your back

Racetrack Playa is a flat of dried mud about four and a half kilometers long, sitting some eleven hundred meters up in the mountains of the national park.[4] It is almost perfectly level, its northern end standing only a few centimeters higher than its southern end.[4] Scattered across it are rocks that range from fist-sized to slabs of a few hundred kilograms, and behind many of them run grooves that bend, fork, and sometimes double back on themselves.[1] The trails were the only evidence, and the motion that made them seemed to happen whenever no one was looking.[3]

Explanations were never in short supply. Visitors and researchers proposed dust devils, gales strong enough to shove stone, and thick rafts of ice that might float the rocks clear of the surface.[3] One geologist argued as early as 1955 that ice was somehow involved, since the largest stones looked far too heavy for wind alone.[4] A later study tracked labeled rocks for seven years without once catching a stone in the act.[4]

The case was closed by a team led by the paleobiologist Richard Norris and his cousin, the engineer James Norris, who set out rocks fitted with GPS loggers and a small weather station in 2011 and expected to wait years for anything to happen.[2] Instead, over the winter of 2013 and 2014, they were standing on the playa when it moved.[1] A shallow pond, only a few centimeters deep, had spread across the flat and frozen overnight into a pane of ice a few millimeters thick.[1] As the morning sun loosened it, the sheet cracked into floating panels, and a light wind of a few meters a second was enough to drive those panels against the rocks and push them slowly through the softened mud.[1]

The reason the motion had stayed hidden was that it is almost absurdly slow. A moving rock creeps along at a few meters a minute, and a whole event can last from a few seconds to about a quarter of an hour before the ice stalls and the stones settle again.[1] On one December day more than sixty rocks slid at once, some traveling over sixty meters, and a person standing among them would have heard little more than the popping and cracking of ice.[1] A stone can then sit untouched for years before the rare coincidence of rain, cold, and wind moves it again.[3]

What the Death Valley rocks rewarded was patience of an unusual kind, the willingness to wire up a blank playa and wait out a process that shows itself for a few minutes a year.[2] The forces behind it proved wholly ordinary, a thin skin of ice and a breeze, combining into something that reads as magic only because its timing is so rare.[1]

The trouble began in the mid-1950s with two traders, Vincent Kosuga, an onion farmer out of New York, and Sam Siegel, who dealt produce in Chicago.[3] Working the futures market on the Chicago Mercantile Exchange, the pair bought up onions and onion contracts until they controlled close to the entire supply sitting in Chicago, tens of millions of pounds of them in storage.[3] With that grip on the market they first squeezed prices upward, then leaned on growers to buy the hoard themselves, threatening to flood the city with onions if they refused.[2]

Having quietly sold much of their stock and bet on a falling market, the two men then let the flood come.[2] The price of a fifty-pound bag of onions fell from around $2.75 in the summer of 1955 to roughly ten cents by the following spring.[2] At the bottom the arithmetic turned surreal, since an empty mesh onion bag cost about twice what a full one would fetch, so the packaging was worth more than the vegetable inside it.[2] Growers who had been paid to hold onions were ruined, and surplus loads were left to rot.[2]

Furious onion farmers carried the story to Washington, where a young Michigan congressman named Gerald Ford, whose district grew the crop, took up their cause.[3] Congress answered not by policing the manipulation but by abolishing the market itself, banning the trading of onion futures outright.[1] The head of the Chicago exchange protested that outlawing an entire market to stop two men was like burning down the barn to find a suspected rat.[3] Kosuga himself drew a trading suspension but no criminal charge, and years later ran a restaurant in New York that he named, with some cheek, the Jolly Onion.[2]

The ban never went away. It remains federal law today, and for more than half a century the onion was the only product Congress had forbidden from the futures markets.[1] It gained company only in 2010, when a financial-reform law added a second forbidden item, contracts on movie box-office receipts.[1] Economists have long noted an awkward coda to the affair. Without a futures market to let growers and buyers lock in prices ahead of time, onion prices appear to have swung more wildly, not less, than those of crops that kept their contracts.[4]

The evidence on that point is genuinely mixed, and studies across the decades have pointed both ways on whether the ban steadied prices or roughened them.[3] What is not in doubt is the shape of the thing, a law written to protect a market that worked by closing it, and one that has now outlived nearly everyone who traded an onion in 1955.[4]

The course is a fixed 253.5 meters, broken by two dry obstacles and one pit of water about a meter deep.[1] The person being carried must weigh at least forty-nine kilograms, and anyone lighter straps on a weighted pack to make up the difference.[1] The rules are relaxed about who that person is, since the carried partner can be a spouse, a neighbor’s, or a friend’s, and the roles are not fixed by gender.[1] The winning pair is handed the carried person’s weight in beer.[1]

Technique has evolved as the times have fallen. The dominant style is the so-called Estonian carry, in which the passenger hangs head-down along the runner’s back with her legs hooked over his shoulders and her arms locked around his waist, leaving both of his hands free.[3] Estonian pairs perfected the hold and won the championship in almost every year between 1998 and 2008.[3] The fastest runs have covered the whole course in under fifty-seven seconds.[3]

The town traces the game to a piece of local folklore rather than to any documented history. The story attaches to a nineteenth-century brigand remembered as Rosvo-Ronkainen, Ronkainen the Robber, who is said to have tested men wanting to join his band by making them haul heavy sacks, or women, across rough country.[2] A related tale ties the sport to an older habit of stealing wives from neighboring villages.[2] Sonkajärvi presents both as legend, the color behind a modern competition it revived in 1992.[2]

What began as a village oddity has quietly gone global, with sanctioned championships in Maine, in Britain, and in Australia drawing regulars of their own.[3] In 2025 the world title left Europe for the first time, taken by an American couple from Wisconsin against entrants from eighteen countries.[4]

The sport holds its shape by taking its measurements seriously while taking little else that way, a course fixed to the tenth of a meter and a prize weighed out to the kilogram.[1] Three decades on from its revival, that mixture of the exact and the absurd has proved durable enough to cross an ocean.[4]