Water, 35 litres. Carbon, 20kg. Ammonia, 4 litres. Lime, 1.5kg. Phosperus, 800g. Salt, 250 g. Saltpeter, 100g. Sulphur, 80g. Fluorine, 7.5g. Iron, 5g. Silicon 3g. And trace amounts of fifteen other elements. 
It’s all the ingredients of the average adult human body. Down to the last specks of protein in your eyelashes. And even though science has given us the entire physical break down there has never been a successful at bring a human to life. 
There’s still something missing something scientists haven’t been able to find in centuries of research