Tibia

The tibia /ˈtɪbiə/ (plural tibiae /ˈtɪbii/ or tibias), also known as the shinbone or shankbone, is the larger and stronger of the two bones in the leg below the knee in vertebrates (the other being the fibula), and it connects the knee with the ankle bones. The tibia is found next to the fibula on the medial side of the leg, closer to centre-line. The tibia is connected to the fibula by the interosseous membrane of leg, forming a type of joint called a syndesmosis with very little movement. The tibia is named for the Greek aulos flute, also known as a tibia. It is commonly recognized as the strongest weightbearing bone of the body.

Structure

In human anatomy the tibia is the second largest bone next to the femur. As in other vertebrates the tibia is one of two bones in the lower leg, the other being the fibula, and is a component of the knee and ankle joints.

The ossification or formation of the bone starts from three centers; one in the shaft and one in each extremity.

The tibia is categorized as a long bone and is as such composed of a diaphysis and two epiphyses. The diaphysis is the midsection of the tibia also known as shaft or body. While the epiphyses are the two rounded extremities of the bone; an upper (also known as superior or proximal) closest to the thigh and a lower (also known as inferior or distal) closest to the foot. The tibia is most contracted in the lower third and the distal extremity is smaller than the proximal.

Post-it note

A Post-it note (or sticky note) is a small piece of paper with a re-adherable strip of glue on its back, made for temporarily attaching notes to documents and other surfaces. A unique low-tack pressure-sensitive adhesive allows the notes to be easily attached, removed and even re-posted elsewhere without leaving residue. Originally small yellow squares, Post-it notes and related products are now available in a wide range of colors, shapes and sizes.

Although 3M's patent ran out in 1997, "Post-it" and the original notes' distinctive yellow color remain registered company trademarks, with terms such as "repositionable notes" used for similar offerings manufactured by competitors. Despite this, the name has become genericized for all such products in many countries.

History

In 1968, a scientist at 3M in the United States, Dr. Spencer Silver, was attempting to develop a super-strong adhesive. Instead he accidentally created a "low-tack", reusable, pressure-sensitive adhesive. For five years, Silver promoted his "solution without a problem" within 3M both informally and through seminars but failed to gain acceptance. In 1974 a colleague who had attended one of his seminars, Art Fry, came up with the idea of using the adhesive to anchor his bookmark in his hymnbook. Fry then utilized 3M's officially sanctioned "permitted bootlegging" policy to develop the idea. The original notes' yellow color was chosen by accident, as the lab next-door to the Post-it team had only yellow scrap paper to use.