ok today i realise something. humans are just like machines. when humans get old some parts of the body will broke down, which mean stop funtion. to prevent or rather said to extent the time from all these happen, humans took vitamins and other supplies. when hamans are sick they will take medicines. and these just like machines send for check up to prevent it from spoil and send for repair when it start to have problems. However, due to the gravity one day humans body will all stop funtion and which means death. same as machines, eventurally, one day they will spoil cannot repair anymore. the only two differents between human and the machines are human can think can talk can do whatever they want. but machines only get to do one thing as that is what they made for. the other differents is human have a funeral after they pass away. but machines will just throw out side the block waiting for someone send them to the rubbish centre to recycel.