Breast cancer cells have vitamin D receptors, and when these receptors are activated by vitamin D, it triggers a series of molecular changes that can slow down cell growth, cause cells to die, and make the cancer less aggressive, she says.
This is not too surprising, since we are constantly moving forward in time, and what is considered modern painting or modern sculpture today, may not be seen as modern in fifty years time. Even so, it is traditional to say that Modern Art means works produced during the approximate period 1870-1970. This Modern era followed a long period of domination by Renaissance-inspired academic art, promoted by the network of European Academies of Fine Art. And is itself followed by Contemporary Art (1970 onwards), the more avant-garde of which is also called Postmodern Art.
For the purposes of Art History, though, when we refer to Paleolithic Art, we're talking about the Late Upper Paleolithic period. This began roughly around 40,000 years ago and lasted through the Pleistocene ice age, the end of which is commonly thought to have occurred near 8,000 B.C. (give or take a few centuries). This period was marked by the rise of Homo sapiens and their ever-developing ability to create tools and weapons.