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: North & South is a British television drama series, produced by the BBC and originally broadcast in four episodes on BBC One in November and December 2004. It follows the story of Margaret Hale (Daniela Denby-Ashe), a young woman from southern England who has to move to the North after her father decides to leave the clergy. The family struggles to adjust itself to the industrial town's customs, especially after meeting the Thorntons, a proud family of cotton mill owners who seem to despise their social inferiors. The story explores the issues of class and gender, as Margaret's sympathy for the town mill workers clashes with her growing attraction to John Thornton (Richard Armitage).
 Question: is there a second season of north and south Context: The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is v = c/n, and similarly the wavelength in that medium is λ = λ/n, where λ is the wavelength of that light in vacuum. This implies that vacuum has a refractive index of 1, and that the frequency (f = v/λ) of the wave is not affected by the refractive index. As a result, the energy (E = h f) of the photon, and therefore the perceived color of the refracted light to a human eye which depends on photon energy, is not affected by the refraction or the refractive index of the medium.
 Question: does refractive index vary with colour of light
Yes
No
No