A child shivers in a cold rain but does not feel cold, what is the biochemistry behind it

Iread all the questions and answers, that person done a lot of work so go ahead and give them brainliest!

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.