Śyāmasundara: They have a scientific way of testing that things disintegrate at a certain rate.
Prabhupāda: But here is a scientist, and he does not agree with that.
Śyāmasundara: What about the half-life of certain elements?
Svarūpa Dāmodara: Yes. The, normally, what they call the age determination, or how old a species is, they normally find out from this so-called (indistinct). They find some bone or something which contains normally carbonate. And normally they get this age of the elements or age of these findings by so-called Carbon 14 method. Carbon 14 is an isotope of normal carbon, it is called Carbon 12. Carbon 14 is radioactive. It's one in which they put in the radioactive testing, and they find out because it follows the normal chemical laws or physical laws. This is governed by the Lord Himself, by Kṛṣṇa Himself. They're finding the chemical lowest form, and from that chemical lowest they normally try to reduce the, how old the sample is, and that method is very limited, it is not applicable to all findings also, and a test, a very reliable test (indistinct) to about five thousand, six thousand years old but beyond that it is very doubtful whether the findings are really true or not. (break) It is empiric so we cannot fully convince that such-and-such species lives such-and-such long just from that finding. You need more evidence to prove it (indistinct) was existing and it disappeared from such-and-such time but it gives a relative value from so-called modern scientific point of view.
Prabhupāda: But evolution we accept. Evolution we accept but it is not that there was no existence of human being. That we do not accept. Evolution we accept. Just like my childhood manifestation is extinct but there are many other child. Same time. So our point is all the species of life, they are existing simultaneously. Evolution there is, we accept that but it is not that one is missing, one has gone away, and another is come, ten million, thirty millions there was no human being. This is all nonsense. He cannot find in the layer, that is not evidence.