Welcome to our daily Bitachon series. We continue to talk about Sha'ar HaBechinah . And as we said in the past, it relates to Sha'ar HaBitachon in a very strong way. There's a Midrash that says there was a Kohen who was going on a business trip. And before he left, he wanted to tell his wife different laws about how to figure out Tzara'at , leprosy. And he told her in his discussion that only one hair grows out of one follicle and two hairs do not grow out of two follicles. She told him if every hair has a follicle and God could sustain the hair, don't you think he could sustain you? Why do you need to travel? And he didn't. So let's talk a little bit about hair follicles and you'll appreciate what a hair follicle is and how God takes care of a hair follicle, and he can take care of you.So a hair follicle is actually a dynamic organ found in mammals. It resides in the dermal layer of the skin, that means it's on the top of your skin. And it has 20 different cell types, each with distinct functions. The hair follicle regulates hair growth, that means who decides how fast your hair is going to grow. And it's a complex interactions with hormones, neuropeptides, and immune cells. That's why sometimes people that have a immune, autoimmune disease, their hair falls out, because there's something wrong with the immunity. And there are different types of hair on different parts of your body. It means the hair on your head and the hair on your beard and the hair on your stomach or the hair on your back are all different kinds of hairs. And we'll get to another interesting point soon. And the hair growth also happens in stages. First is it actively grows, then it's at a resting stage, then it regresses, then it sheds, and then it's empty for a time till the next stage goes on. Interesting enough. Then we have a gland called a sebaceous gland which is a microscopic exocrine gland. That means it's a type of gland in the skin that opens into the hair follicle. It means you have the hair follicle and there's a little tube, microscopic, that enters the hair follicle. And what's its job? It secretes an oily or waxy matter which lubricates the hair and the skin.These glands are in the greatest number in the face and the scalp. That's why your face gets oily and your scalp gets oily. But it's on other parts of the body as well, except for your palm of your hands and the sole of your feet because we don't want the palms of your hand or the soles of your feet to be slippery. And this gland secretes an oily, waxy substance. And it's a lot of chemicals go into that. We're not going to bore you with the details. It also helps in our thermoregulatory cycle. That means it helps depending on the heat and the cold. In hot conditions, the secretion emulsifies the sweat. And that way the sweat is not easily lost and it stays on the body. It's important to delay dehydration. In colder conditions, it becomes more lipid and it causes rain to be repelled.It also serves as a shield against microorganisms. So there's it secretes an acid, and this slightly acidic film on the surface of the skin is a barrier to prevent the microbes that might penetrate the skin. Now this is an unbelievable one. During the last three months of fetal development, the sebaceous gland of the fetus produces a waxy white substance that cover, that coats the skin to protect it from amniotic fluid. Wild. That means out of the 120 years you're alive, for three months the gland decides to secrete a different type of substance that specifically will protect the embryo from the amniotic fluid. Wonder of wonders. And this is one of the things the Chovot HaLevavot says in Sha'ar HaBitachon where God's taking care of me in the womb is protecting me. How? In this wild concept.Now, there are also glands in the eyelids that secrete a different form of sebum onto the eye that slows the evaporation of tears. It also serves to create an airtight seal when the eyes are closed and prevents the eyelids from sticking together. They attach directly to the follicles of the eyelashes which are arranged vertically within the eyelids. This is wonder of wonders. More than that, as we said, all these different type of glands produce different types of wax and oil. My father's a dermatologist told me once that there's something called lice. We don't want to know about those lice. You have to clean your hair for lice and and so on. But there's different lice that do grow on different parts of the body depending on the type of secretions there are and oils and waxes, they have different habitats, just like different habitats of the world have different animals living on them. Different habitats of your body, because man is called an olam katan , a mini world. So you have the Amazon jungle in your hair where you have rhinoceroses like to hang out there. Then you might have on your stomach some other type of jungle and so on and so forth throughout your body. And different animals and different creatures like those habitats. These are wonders and wonders, and this is just about the hair follicle. And again, shaar bechinah is about appreciating these wonders and saying, wow, if Hashem could take care of the hair follicle.