Does what we do really echo in eternity? Do our lives matter? To us they do, of course. To our nearest and dearest, we hope. And presumably to a wider circle of people and things around us. But outside of that? And if so, to whom? Ausra Revutaite dedicated 30 years of her life to the lonesome study of the Tuyuksu glacier in the Tian Shan mountains in Kazakhstan. The glacier is everything to the woman. But is she anything…