the cool thing about steroids is that their liposome. that means they can cross memories, cross the blood stream barrier. tthe testosterone progesterone, this is all into our brains so we produce them mostly in our ovaries and in our testes. some in our four women the adrenal gland is an important piece of androgen production but those hormones are getting into our brain and shaping behavior and that's clear in humans and nonhuman animals. so they have important effects on the body and on behavior and ultimately those are moans are there not because they help us survive, let's say in regulating blood sugar and i just want to use insulin as an example quickly because that's a hormone that ypacks in the body to regulate energy. and regulate blood sugar. but what it does is it four minutes behavior with the energetic needs of the body so it's signals to the brain. it can get into the brain but it's a different active transport.they have to expend energy to get into the brain. it gets into the brain and tells the brain essentially what the e