Medically reviewed by Jonathan B. Jassey, DO Tanner stages are a tool used by healthcare providers to evaluate development in ...

and human population growth (e.g., how fast will the human population ... stable over a long period of time can experience a new phase of rapid, long-term growth. One of the most challenging ...

We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.

[6] Telogen hair follicles are those in the final resting phase before the hair is shed as club hair (Fig 2). In general, hair growth occurs from the forehead to the nape of the neck. At birth ...