Śrīla Prabhupāda.  But God has given them everything necessary to live peacefully, and everything necessary to understand Him. So why will they not inquire about God? Instead, they do things that help them forget God.
Dr. Singh.  Now the scientists have organized a whole department in science called gerontology, in which they study how to prolong life.
Śrīla Prabhupāda.  Their real aim should be to stop the suffering. Suppose an old man is in great pain, suffering from many diseases, and suddenly the doctors increase his life-span. What is the profit?
Dr. Singh.  That is what they do with heart transplants..
Śrīla Prabhupāda.  It is nonsense! Let them stop death;  that  would be an achievement. Let them stop all disease; ah,  that  would be an achievement. They cannot do these things! Therefore, I say that all their research is simply a struggle for existence. Kṛṣṇa says in  Bhagavad-gītā  (15.7):
mamaivāṁśo jīva-loke jīva-bhūtaḥ sanātanaḥ manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni karsati
"The living entities in this conditioned world are My eternal, fragmental parts. Due to conditioned life, they are struggling very hard with the six senses, which include the mind."
Student.  Now there is a shortage of oil...
Śrīla Prabhupāda.  Yes, we have built a civilization that is dependent on oil. This is against nature's law, and therefore there is now an oil shortage. By nature's law, winter is now coming. Scientists cannot stop it and turn it into summer. They wrongly think they are in control of nature. In  Bhagavad-gītā  Kṛṣṇa informs us that the living being thinks himself to be the doer of activities that are in actuality carried out by nature. The sun is now rising. Can they make it dark? And when it is dark, can they command the sun, "Get up!" They do not realize that if they really want to conquer nature, they should try to conquer birth, death, old age and disease. In  Bhagavad-gītā  (7.14) Kṛṣṇa says:
daivī hy eṣā guņa-mayī mama māyā duratyayā mām eva ye prapadyante māyām etāṁ taranti te
"This divine energy of Mine, consisting of the three modes of material nature, is difficult to overcome. But those who have surrendered unto Me can easily cross beyond it."
Dr. Singh.  So, is it very hard to overcome nature's laws?
Śrīla Prabhupāda.  For the materialists, it is impossible. But if one surrenders to Kṛṣṇa, it becomes easy.
The Real Origin of Speciess
Dr. Singh.  To explain why there are so many varieties of living entities, the scientists say that at a certain time during evolution, the cells' genes, which normally reproduce themselves