Why are Scientists unable to stop death?

Why are Scientists unable to stop death?

There are Many Type of Death 1)Natural death (for old people) 2)Death by Any Accident(untiming death) 3)Death by Diseases(Untiming death),etc.Air,water,Foods,Climates are necessary for life, in spite of this,Persons die,it means that soul is compulsory for any life and soul exists.After Certain Time,Every Persons die,But Scientists are unable to stop death.Some people die before right time and some people die after becoming old.it means that soul exists and soul is life.Every Thing happen in front of Scientists but they are unable to stop death,why?
Some times,dead child is born,it means that soul is unborn and soul exists because firstly he enters and then exit due to some reason.It means that i am true. Every Body requires the Spiritual Energy. Due to Spiritual Energy, Person is able to think and learn. Due to Spiritual Energy, Person is able to study and remember. Due to Spiritual Energy, Whole Cells of Body are connect to each other. Due to Spiritual Energy, Person is able to walk, speak,watch and listen. Soul is a Energy. Energy of Spirit is called the Spiritual Energy.