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: Some authors use more general definitions of ``positive definite'', including some non-symmetric real matrices, or non-Hermitian complex ones.
 Question: can a positive definite matrix be non symmetric Context: In the United Kingdom, the slaughter, preparation, and consumption of horses for food is not against the law, although it has been rare since the 1930s and it is not generally available. There is a cultural taboo against consuming horse meat in the UK, although it was eaten when other meats were scarce, such as during times of war (as was whale meat, which was never popular in Britain). The sale of meat labelled as horse meat in supermarkets and butchers is minimal, and most of the properly described horse meat consumed in the UK is imported from Europe, predominantly the south of France, where it is more widely available.
 Question: can you sell horse meat in the uk Context: Free and membrane-bound ribosomes differ only in their spatial distribution; they are identical in structure. Whether the ribosome exists in a free or membrane-bound state depends on the presence of an ER-targeting signal sequence on the protein being synthesized, so an individual ribosome might be membrane-bound when it is making one protein, but free in the cytosol when it makes another protein.
 Question: are free ribosomes and membrane bound ribosomes identical
Yes
Yes
Yes
Yes