This is a very vague question. Provide specific examples. "new ideas" can mean almost anything.

What kind of answer are you seeking? Is "No" sufficient? How can anyone answer this in a meaningful way.

What new ideas do you mean? Niddah is the issuing of blood during menstruation. That has not changed.

@interested Not necessarily. The halacha is that a woman who issues blood because of the menstrual cycle is tamei. The details of what happens inside the body do not matter. In any case, laws of the torah cannot be changed.

@sabbahillel They certainly do. Not everytime is the woman tomai because some blood is not considered dam nidda or from the menstrual cycle even coming from the womb. That depends on doctors not on laws of the torah. You had better go to your rabbi and find out. In plain English there are heterim which depend on doctors.

A pity only five have seen my post. It deserves a much wider audience. It is so important. And means no one is keeping nidda today. That is a fact which one cant argue with, to which the only answer is that they never kept it and therefore dont have to keep it today either. Which is really my question 'is that right'. Comments are supposed to explain questions.

Interested does it bother you that you're the only person the world that thinks no one keeps Hilchos Niddah? Isn't that a little telling that perhaps you're missing something?

@interested Actually the fact that the taharas hamishpacha groups in o many locations do keep hilchos niddah and that the mikvaos in so many cities are active show that you are mistaken. Your claim that women are not keeping hilchos niddah is like claiming that no one keeps shabbos or eats kosher food.

@interested I don't know what you're missing because you're being vague about the origins of your opinions but to claim that no Jew keeps kashrus or Niddah and you're the only one who knows this secret would make any rational human being realize they're missing something. It's up to you for figure out what, as the burden of proof is on you.