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 fifth round (also known as the Hexagonal or Hex) of CONCACAF matches for 2018 FIFA World Cup qualification was played from 11 November 2016 to 10 October 2017. Mexico, Costa Rica, and Panama qualified for the 2018 FIFA World Cup, while Honduras qualified for (and was later eliminated in) the inter-confederation play-offs, and United States (who failed to qualify for the World Cup for the first time in 32 years) and Trinidad and Tobago were eliminated in this round.
 Question: did mexico qualify for the world cup 2018 Context: The cousin relationship is further detailed by degree and removal. For example the second cousin once removed relationship is a second-degree cousin with one removal.
 Question: is there such a thing as second cousin Context: A fog machine, fog generator, or smoke machine is a device that emits a dense vapor that appears similar to fog or smoke. This artificial fog is most commonly used in professional entertainment applications, but smaller, more affordable fog machines are becoming common for personal use. Fog machines can also be found in use in a variety of industrial, training, and some military applications. Typically, fog is created by vaporizing proprietary water and glycol-based or glycerin-based fluids or through the atomization of mineral oil. This fluid (often referred to colloquially as fog juice) vaporizes or atomizes inside the fog machine. Upon exiting the fog machine and mixing with cooler outside air the vapor condenses, resulting in a thick visible fog.
 Question: do you put water in a fog machine Context: A unique, stimulus-specific set of mast cell mediators is released through degranulation following the activation of cell surface receptors on mast cells. Examples of mediators that are released into the extracellular environment during mast cell degranulation include:
 Question: is a cell surface receptor on the mast cell Context: Although it is widely believed that a worker honey bee can sting only once, this is a partial misconception: although the stinger is in fact barbed so that it lodges in the victim's skin, tearing loose from the bee's abdomen and leading to its death in minutes, this only happens if the skin of the victim is sufficiently thick, such as a mammal's. Honey bees are the only hymenoptera with a strongly barbed sting, though yellow jackets and some other wasps have small barbs.
 Question: does a honey bee die after it stings you Context: In fluid flow, friction loss (or skin friction) is the loss of pressure or ``head'' that occurs in pipe or duct flow due to the effect of the fluid's viscosity near the surface of the pipe or duct. In mechanical systems such as internal combustion engines, the term refers to the power lost in overcoming the friction between two moving surfaces, a different phenomenon.
 Question: is head loss the same as friction loss
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