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: Damon Salvatore is a fictional character in The Vampire Diaries novel series. He is portrayed by Ian Somerhalder in the television series. Initially, Damon is the main antagonist in the beginning of the show and later became a protagonist. After the first few episodes, Damon begins working alongside his younger brother, Stefan Salvatore, to resist greater threats and gradually Elena begins to consider him a friend. His transition was completed after his younger brother Stefan, who is also a vampire, convinces him to drink blood. Damon, angry that Katherine chose to turn Stefan as well, vows to make his brother's life sorrowful -- thus further causing a century-long rift between the two brothers. Elena Gilbert chooses to be with Damon in the finale episode.
 Question: in vampire diaries do elena and damon date Context: Deforestation in the United States is an ongoing environmental issue that attracts protests from environmentalists. Prior to the arrival of European-Americans, about one half of the United States land area was forest, about 1,023,000,000 acres (4,140,000 km) estimated in 1630. Recently, the Forest Service reported total forestation as 766,000,000 acres (3,100,000 km) in 2012. The majority of deforestation took place prior to 1910 with the Forest Service reporting the minimum forestation as 721,000,000 acres (2,920,000 km) around 1920. The forest resources of the United States have remained relatively constant through the 20th century.
 Question: is deforestation a problem in the united states Context: Professional golf in the U.S. is mainly run by the PGA Tour, the LPGA, and the PGA of America. However, the USGA is at the heart of amateur golf in the country and organizes the 10 national amateur championships. The leading events are open to all age groups, but are usually won by golfers in their early twenties who are working towards a career in professional tournament golf:
 Question: is the usga the same as the pga Context: The medullary ascending limb is impermeable to water. Sodium (Na), potassium (K) and chloride (Cl) ions are reabsorbed by active transport. K is passively transported along its concentration gradient through a K leak channel in the apical aspect of the cells, back into the lumen of the ascending limb. This K ``leak'' generates a positive electrochemical potential difference in the lumen. This drives more paracellular reabsorption of Na, as well as other cations such as magnesium (Mg) and importantly calcium Ca due to charge repulsion.
 Question: is the thick ascending limb permeable to water Context: From 2010, refuelling is no longer permitted during the race: every car starts with a full fuel load. The 2010 season cars were about 22 cm longer than 2009 cars to accommodate the enlarged fuel tank this necessitated.
 Question: do formula one cars refuel during the race
Yes
Yes
Yes
No
No
No