Svarūpa Dāmodara: Śrīla Prabhupāda, what is the Vedic explanation of the working principle of the brain, how our brain is working.
Prabhupāda: Brain is working, because you living entity, soul, is there. Just like I am typing, and he is typing. I have got the latest mechanical, improved typist, and he has got old, bygone age typist, similarly, according to our karma, capacity, Kṛṣṇa gives us facility. So brain is that facility. Kṛṣṇa gives us. Not that... So far the brain substance is concerned, a dog's brain and your Professor Einstein's brain is the same. His brain, same. But because Professor Einstein is advanced in knowledge, he is working differently. Otherwise, when Einstein, the soul is off from the body, and the dog is off from the body, you will see the brain, equally the same. So this, your scientists, they do not know.
Svarūpa Dāmodara: They say that there are about nine billion cells. They are called neurons.
Prabhupāda: That's all right. Just like I have given already. Why nine billion cells are there? Because you can work with it. I have given an electric running on typewriter because I know how to work it. Otherwise, this electric machine and the old electric machine, they are made of the same iron, but if I know how to work it, then I can utilize this machinery. But for a layman, it will be all the same. So that is karma. According to karma, we get a body. The body's machinery is also well-equipped, as I can work. This is nature's gift. Not that "This brain is first-class, that brain is first-class, er last class." All brain, last class. It is matter. The man who is working, the soul who is working, he is first-class, second-class, third-class. It is said clearly, īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati: (BG 18.61) "Īśvara, Kṛṣṇa, is situated in everyone's heart." Bhrāmayan sarva-bhūtāni yantrārūḍhāni māyayā: (BG 18.61) "He is offered a yantra, a machine, made by material energy." But that is under the direction of Kṛṣṇa. Kṛṣṇa has asked the material energy "Give a good machine; he can work. Good or bad, as He wants, as He wants. That's all. Give him a..." yantrārūḍhāni māyayā. It is all bad. Either this electric machine or that manual machine. They are all matter. So anything material, that is bad. But he wants it; "All right, give it." That is going on. He wants this facility. Now before these motorcars, people were walking on foot. All business was being done. But we wanted a machine like that, so Kṛṣṇa has given us brain to manufacture. That's all. But what you will benefit by this? Therefore Kṛṣṇa says, "You give up all this nonsense proposal." But they will not do that. They will create another nonsense desire. That desire should be stopped. That is desireless. Because they will go on simply proposing some nonsense desire... That is their material existence. Now, they have discovered this, made this motor, nice... Now there is problem, no power, gasoline. And if the gasoline is stopped, then your whole endeavor is gone. So this is their business. They are manufacturing something which will entangle him more and more. That he does not know.