Absolutely - let me retrospectively adjust the panspermia 'a few billion years ago' to include potentially quite recent cross-fertilisation. In any case it mak

Absolutely - let me retrospectively adjust the panspermia 'a few billion years ago' to include potentially quite recent cross-fertilisation. In any case it makes it much less interesting, as it implies same origin. Implies but does not prove, I should add, of course.