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 system was introduced after George Washington had announced his retirement upon the end of his second term, when the Democratic-Republican Party, and Federalist Party began contesting elections on a partisan basis. Both parties may have held informal caucuses in 1796 to try to decide on their candidates. After the disorganized electoral voting of 1796, both parties held formal caucuses in 1800 that selected their respective presidential candidates (prior to the ratification of the 12th Amendment in 1804 each party ran two presidential candidates). The Federalists secretly held their caucus in early May, but later made their ticket of President John Adams and Charles Cotesworth Pinckney public. The Democratic-Republicans also secretly met in May, and agreed to equally support Thomas Jefferson and Aaron Burr for president. The Federalists did not hold another caucus after 1800.
 Question: originally presidential candidates were selected by party caucuses in congress Context: Rice production is important to the economy of the United States. Of the country's row crop farms, rice farms are the most capital-intensive, and have the highest national land rental rate average. In the US, all rice acreage requires irrigation. In 2000-09 approximately 3.1 million acres in the US were under rice production, while an increase is expected in the next decade to approximately 3.3 million acres. US Rice represents rice producers in the six largest rice-producing states of Arkansas, California, Louisiana, Mississippi, Missouri, and Texas.
 Question: do they grow rice in the united states Context: Gestation in a dog is 63 days in length, if measured from the day of ovulation. Since it is difficult to determine the exact date of ovulation, errors are often made in calculating gestation period. Canine sperm can live for 10 to 11 days in the uterine tubes (fallopian tubes) so if a female is bred 10 days before the oocytes (eggs) can be fertilized, she will appear to have a gestation length of 70 days. If she is bred on the day the oocytes can be fertilized, her gestation length will appear to be 60 days long.
 Question: do different dog breeds have different gestation periods Context: Robin Williams (1951--2014) was an American actor and comedian who throughout the course of his career won numerous awards, including an Academy Award for Best Supporting Actor for his role in Good Will Hunting (1997). He also won six Golden Globe Awards, including Best Actor -- Motion Picture Musical or Comedy for his roles in Good Morning, Vietnam (1987), The Fisher King (1991) and Mrs. Doubtfire (1993), along with the Cecil B. DeMille award in 2005.
 Question: did robin williams ever won an academy award Context: According to the theory of relativity, no information can travel faster than the speed of light in vacuum, but this does not mean that the refractive index cannot be lower than 1. The refractive index measures the phase velocity of light, which does not carry information. The phase velocity is the speed at which the crests of the wave move and can be faster than the speed of light in vacuum, and thereby give a refractive index below 1. This can occur close to resonance frequencies, for absorbing media, in plasmas, and for X-rays. In the X-ray regime the refractive indices are lower than but very close to 1 (exceptions close to some resonance frequencies). As an example, water has a refractive index of 6999999999740000000♠0.99999974 = 1 − 6993260000000000000♠2.6×10 for X-ray radiation at a photon energy of 6985480652946099999♠30 keV (0.04 nm wavelength).
 Question: can a refractive index be less than 1
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