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 saguaro (/səˈwɑːroʊ/, Spanish pronunciation: (saˈɣwaɾo)) (Carnegiea gigantea) is an arborescent (tree-like) cactus species in the monotypic genus Carnegiea, which can grow to be over 40 feet (12 m) tall. It is native to the Sonoran Desert in Arizona, the Mexican State of Sonora, and the Whipple Mountains and Imperial County areas of California. The saguaro blossom is the state wildflower of Arizona. Its scientific name is given in honor of Andrew Carnegie. In 1994, Saguaro National Park, near Tucson, Arizona, was designated to help protect this species and its habitat.
 Question: is arizona the only state with saguaro cactus Context: The phase velocity of an electromagnetic wave, when traveling through a medium, can routinely exceed c, the vacuum velocity of light. For example, this occurs in most glasses at X-ray frequencies. However, the phase velocity of a wave corresponds to the propagation speed of a theoretical single-frequency (purely monochromatic) component of the wave at that frequency. Such a wave component must be infinite in extent and of constant amplitude (otherwise it is not truly monochromatic), and so cannot convey any information. Thus a phase velocity above c does not imply the propagation of signals with a velocity above c.
 Question: can phase velocity be greater than speed of light Context: The Czech Republic, a member of the European Union (EU), uses the Czech koruna as its currency, regulated by the Czech National Bank, a member of the European System of Central Banks, and does not participate in European Exchange Rate Mechanism II (ERM II). It is bound by its 2003 Treaty of Accession to the EU to adopt the euro and join the eurozone once it has satisfied the euro convergence criteria.
 Question: is czech republic a member of the eu Context: The Smallville incarnation of the character is first introduced as a morally ambiguous character, who walks a fine line between good and evil. Lex is an inquisitive person, and it is that curiosity that drives him to attain as much power as possible as the series progresses--it will ultimately lead him to being Clark's greatest enemy. Michael Rosenbaum has been nominated for and won a Saturn Award and a Teen Choice Award for his portrayal of Lex Luthor on Smallville. After seven seasons as a series regular, Michael Rosenbaum left the show, but reprised the role for the two-hour series finale.
 Question: is lex luthor a good guy in smallville Context: Harry Potter and the Forbidden Journey uses KUKA robocoaster technology, which allows the seats to pivot while being held above the track by a robotic arm. However, the ride is not a roller coaster but a scenic dark ride. The experience includes a flight around Hogwarts castle, an encounter with the Whomping Willow and a horde of Dementors, and a Quidditch match. The ride drops, spins around, twists and turns, but does not turn upside down, though passengers sometimes lie flat on their backs. Over-the-shoulder bars are used to secure guests in their seats, and a single parabolic metal bar is used as a hand grip. At the conclusion of the ride, guests exit into Filch's Emporium of Confiscated Goods gift shop.
 Question: is the forbidden journey ride a roller coaster
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