Donate body to science?

The Gemara asks: From where do we derive the prohibition with regard to an offering itself? It is derived from a verse, as it is written: “They joined themselves also unto Baal of Peor, and ate the offerings to the dead” (Psalms 106:28). This verse teaches that just as deriving benefit from a corpse is prohibited, so too, deriving benefit from an offering of idolatry is prohibited.

The Gemara asks: And from where do we derive the prohibition of a corpse itself? The Gemara answers: It is derived from a verbal analogy between the words “there” and “there” employed with regard to the heifer whose neck is broken to absolve a city from bearing responsibility for the death of a visitor. It is written here: “And Miriam died there” (Numbers 20:1), and it is written there: “And the elders of that city shall bring down the heifer unto a rough valley, which may neither be plowed nor sown, and shall break the heifer’s neck there in the valley” (Deuteronomy 21:4). Just as there, deriving benefit from the heifer is prohibited, so too here, deriving benefit from a corpse is prohibited.

If any party is guilty of a capital offense and is put to death, and you impale the body on a stake,

you must not let the corpse remain on the stake overnight, but must bury it the same day. For an impaled body is an affront to God: you shall not defile the land that your God יהוה is giving you to possess.

Rabbi Meir said: The phrase “for he that is hung is a curse [kilelat] of God” should be understood as follows: When a man suffers in the wake of his sin, what expression does the Divine Presence use? I am distressed [kallani] about My head, I am distressed about My arm, meaning, I, too, suffer when the wicked are punished. From here it is derived: If God suffers such distress over the blood of the wicked that is spilled, even though they justly deserved their punishment, it can be inferred a fortiori that He suffers distress over the blood of the righteous. And the Sages said not only this, that an executed transgressor must be buried on the same day that he is killed, but they said that anyone who leaves his deceased relative overnight with-out burying him transgresses a prohibition. But if he left the deceased overnight for the sake of the deceased’s honor, e.g., to bring a coffin or shrouds for his burial, he does not transgress the prohibition against leaving him unburied overnight. After the executed transgressor is taken down he is buried, and they would not bury him in his ancestral burial plot. Rather, two graveyards were established for the burial of those executed by the court: One for those who were killed by decapitation or strangled, and one for those who were stoned or burned.