Answer: No it does not say Gin Ichimaru dies or comes back yet. Yes he is hurt badly from were Aizen stabbed him twice showned on bleach manga 416. Ichigo or someone is probably going to defeat him. Ofcourse, he comes back in Bleach :D
Answer: Bleach cannot kill you, however mixing bleach with other household chemicals can produce harmful fumes such as chlorine gas. Chlorine is the number one chemical that has had the most injuries and deaths than any other chemical because of an accident or intentional. However, bleach does not have many effects on the body because bleach has roughly 85% water and the rest is chlorine.
Bleach when mixed with other chemicals creates harmful fumes. Chlorine gas can be very irritating although in household chemicals can only be harmful. In a industrial setting it can be more deadly although very few people die from Chlorine gas.
Answer: Taste buds are clusters of Taste Receptor Cells (TRC). The taste buds contain pores that open enabling the molecules we put into our mouth to reach the TRC inside. The TRCs communicate to the brain through a sensory neuron by an ATP releasing synapse.
During the process of human evolution, our ancestors found that many plants that were bitter were in fact toxic and caused either nausea/vomiting, other unpleasant side effects, or death. Thus a natural process was set in place where humans eventually discriminated
as to which foods were likely to be good or bad for health, with natural preferences evolving towards fruits and fatty foods, providing the greatest calorie intake or density. Also probably why even today we prefer doughnuts to broccoli.