Biodegradable polymer which, edible films have gained more attention due to their environmentally-friendly characteristics, vast variety and availability, non-toxicity, and low cost. Biodegradable polymers have a long history, and since many are natural products, the precise timeline of their discovery and use cannot be accurately traced. One of the first medicinal uses of a biodegradable polymer was the catgut suture, which dates back to at least 100 AD. The first catgut sutures were made from the intestines of sheep, but modern catgut sutures are made from purified collagen extracted from the small intestines of cattle, sheep, or goats. The concept of synthetic
EWI (musical instrument) versatile instrument. The air pressure sensor allows for a considerable dynamic range. EWI (musical instrument) EWI (from electronic wind instrument, pronounced "EE-wee") is a type of wind controller, an electronic musical instrument. It was invented by Nyle Steiner, who conceptualized the idea in the 1960s, and developed the first working models in the 1970s. The early models consisted of two parts: a wind controller and a digitally-controlled analog synthesizer in a rackmount box (which also houses the instrument's electronics). Japanese company Akai took over the instrument from Steiner and released several models (with his design help). The current top models,