Sun exposure signals the deeper layers of the skin to make melanin. Melanin is then sent up to the surface layers of the skin to…
Vitamin D is one of the oldest hormones we know of. Plants and fungi make vitamin D2 , also called Ergocalciferol. It is similar to…
We are one of the few animals on earth without feathers, scales or fur. It turns out to be a bit risky not to have…
