Context: Death from laughter is a rare form of death, usually resulting from cardiac arrest or asphyxiation, caused by a fit of laughter. Instances of death by laughter have been recorded from the times of ancient Greece to the modern day.
 Question: can you have a heart attack from laughing Context: It was long believed that carbonic acid could not exist as a pure compound. However, in 1991 scientists at NASA's Goddard Space Flight Center (USA) succeeded in making solid HCO samples. They did so by exposing a frozen mixture of water and carbon dioxide to high-energy proton radiation, and then warming to remove the excess water. The carbonic acid that remained was characterized by infrared spectroscopy. The fact that the carbonic acid was prepared by irradiating a solid HO + CO mixture, or even by irradiation of dry ice alone, has given rise to suggestions that HCO might be found in outer space or on Mars, where frozen ices of HO and CO are found, as well as cosmic rays. It was announced in 1993 that solid carbonic acid had been created by a cryogenic reaction of potassium bicarbonate and HCl dissolved in methanol. Later work showed that in fact the methyl ester had been formed, but other methods were successful. Theoretical calculations showed that a single molecule of water can catalyze the decomposition of a gas-phase carbonic acid molecule to carbon dioxide and water. In the absence of water, the dissociation of gaseous carbonic acid has been predicted to be very slow, with a half-life of 180,000 years. This only applies if the molecules are few and far between, because it has also been predicted that gas-phase carbonic acid will catalyze its own decomposition by forming dimers, which then break apart into two molecules each of water and carbon dioxide.
 Question: does carbonic acid decompose into water and carbon dioxide Context: Unlike saves, wins, and losses, more than one pitcher per team can earn a hold for a game, though it is not possible for a pitcher to receive more than one hold in a given game. A pitcher can receive a hold by protecting a lead even if that lead is lost by a later pitcher after his exit.
 Question: can a pitcher get a hold of his team loses Context: Brussels-South (French: Bruxelles-Midi, Dutch: Brussel-Zuid, IATA code: ZYR) is one of the three major railway stations in Brussels (the other two are Brussels Central and Brussels North) and the busiest station in Belgium. It is located on the territory of the municipality of Saint Gilles/Sint Gillis.
 Question: is brussels zuid the same as brussels midi Context: Four descents have been achieved. The first was the manned descent by Swiss-designed, Italian-built, United States Navy-owned bathyscaphe Trieste which reached the bottom at 1:06 pm on 23 January 1960, with Don Walsh and Jacques Piccard on board. Iron shot was used for ballast, with gasoline for buoyancy. The onboard systems indicated a depth of 11,521 m (37,799 ft), but this was later revised to 10,916 m (35,814 ft). The depth was estimated from a conversion of pressure measured and calculations based on the water density from sea surface to seabed.
 Question: have we ever been to the bottom of the marianas trench
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