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: The desert comprises much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and Sudan. It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south, it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan Region of Sub-Saharan Africa. The Sahara can be divided into several regions including: the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.
 Question: does the sahara desert stretch across the northern half of africa Context: Drunk driving is the act of operating a motor vehicle while the operator's ability to do so impaired as a result of alcohol consumption, or with a blood alcohol level in excess of the legal limit. For drivers 21 years or older, driving with a blood alcohol concentration (BAC) of 0.08% or higher is illegal. For drivers under 21 years old, the legal limit is lower, with state limits ranging from 0.00 to 0.02. Lower BAC limits apply when operating boats, airplanes, or commercial vehicles. Among other names, the criminal offense of drunk driving may be called driving under the influence (DUI), driving while impaired (DWI), or operating while impaired (OWI).
 Question: is a dui a criminal offense in the usa Context: In 2006, the first publication of experimental transplantation of bioengineered bladders appeared in The Lancet. The trial involved seven people with spina bifida between the ages of four and nineteen who had been followed for up to five years after surgery to determine long-term effects. The bladders were prepared and the trial run by a team of biologists at the Wake Forest University School of Medicine and Boston Children's Hospital led by Professor Anthony Atala.
 Question: is there such a thing as a bladder transplant Context: Twenty-two years after Mary's death, John disappears while on a hunt, forcing Sam and Dean to reunite in an unsuccessful attempt to find him. Sam returns to the life of a hunter after Azazel kills his girlfriend. John reluctantly chooses to avoid his sons throughout most of the season while he investigates something, eventually reuniting with them in the episode ``Shadow.'' However, the demonic Meg Masters attacks them and reveals that Azazel is after John. After escaping from Meg, the brothers split up from their father to keep him from the demons. When vampires murder his old mentor and steal the Colt--a mystical gun capable of killing anything--John teams up with Sam and Dean in ``Dead Man's Blood'' to retrieve it. Because demons cannot be killed by conventional means, they hope that the Colt will be effective against Azazel. In response, Meg begins killing the Winchesters' friends in ``Salvation,'' and threatens to kill more unless they deliver the Colt. John is captured after trying to give her a fake gun, and reveals himself to be possessed by Azazel when the brothers come to his rescue in the first season finale ``Devil's Trap.'' However, he manages to resist the demon's control. Despite John's pleas for Sam to shoot him with the Colt, Sam cannot bring himself to do so and allows Azazel to escape. As the Winchesters flee in Dean's Impala, a demonically-possessed trucker crashes into them.
 Question: do sam and dean find their dad in season 1
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