A chemical vital for life on Earth may have arrived ready-made from space. Unexpectedly, a chondritic meteorite has been found to contain large amounts of ammonia, a nitrogen-rich chemical needed to form the basic building blocks of life, including proteins, DNA and RNA.
Explaining how the early Earth gained enough ammonia for life to begin has been a puzzle, because sunlight rapidly destroys ammonia gas in the atmosphere. Furthermore, geological samples suggest that the environment was chemically neutral, rather than the reducing conditions that would have favoured ammonia formation.
If you bring politics to this thread it had better be directly relevant or I will delete it.