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: Chinese, also known as Sinitic, is a branch of the Sino-Tibetan language family consisting of hundreds of local language varieties, many of which are not mutually intelligible. The differences are similar to those within the Romance languages, with variation particularly strong in the more rugged southeast. These varieties, often called ``dialects'', have been classified into seven to ten groups, the largest being Mandarin (e.g. Beijing dialect), Wu (e.g. Shanghainese), Min (e.g. Hokkien), and Yue (e.g. Cantonese).
 Question: is there a difference between cantonese and mandarin Context: In general, travelers in transit do not require a visa to transit through South Korea for less than 24 hours (for Incheon Airport) or when departing on the same calendar day (for all other airports) as long as they stay within the transit area.
 Question: do i need a transit visa for south korea 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 Context: Tornadoes have been documented in every U.S. state (not including the non-state territories of Guam, the Virgin Islands, American Samoa, and Puerto Rico) at least once since 1950, although some regions and states are hit by tornadoes far more than others. For example, the average number of tornadoes to hit the states of Alaska, Rhode Island, and Vermont is less than one, while the state of Oklahoma receives an average of 52 tornadoes per year, and the state of Texas is hit with 126 tornadoes in an average year. The state with the most tornadoes per unit area is Florida, though most are weak tornadoes of EF0 or EF1 intensity. A number of Florida's tornadoes occur along the edge of hurricanes that strike the state. The state with the highest number of strong tornadoes per unit area is Oklahoma. States such as Oklahoma and Kansas have much lower population densities than Florida, so tornadoes may go unreported.
 Question: are there any states that don't have tornadoes Context: The Northern and Central Bitterroot Range, collectively the Bitterroot Mountains (Salish: čkwlkwqin ), is the largest portion of the Bitterroot Range, part of the Rocky Mountains, located in the panhandle of Idaho and westernmost Montana in the Western United States. The mountains encompass an area of 4,862 square miles (12,593 km2).
 Question: are the bitterroot mountains part of the rockies
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Yes