If you look up the published tables of the atomic mass of helium - 4 it has been replaced by the average of the naturally occurring abundance of helium isotopes. This has been done to prevent the yield due to the mass defect from Hydrogen
I now have a car that looks a bit different from before, the car is snub nosed and I drove two hundred miles today and used no petrol as far as I could tell and the car is far more powerful than before. The bonnet is sealed and there no way of putting oil in. There is a petrol