These surgical hats have a close-fitting and are made for healthcare personnel with shorter hair. They do not possess a lot of extra space, so they aren't fit for a person with long voluminous hair. They are an ideal option if you have shorter and less dense hair.
http://www.zojemedicalproduct.....com/hospital-bandage

The first step to achieving a more portable shopping cart is building it from strong but lightweight materials. Heavier carts aren’t just more difficult to push and pull — they can also quickly gain momentum, leading to accidents and injuries. So, the lighter the cart, the easier and safer it is to maneuver. Of course, this doesn’t mean a cart can be built from cheap materials.
http://www.tengtrolley.com/folding-shopping-cart/

As we said in the previous paragraph, there is no record of their being an hourglass in Europe before the Early Middle Ages. And the very first hourglass is said to have been made by a french monk named Liutprand during the eighth century A.D. But it wasn’t until the 14th century that Hourglass clocks were seen more commonly.
http://www.skyringecraft.com/s....and-timer-hourglass/

The general Polyimide film will appear yellow. The measured optical density value measured with a densitometer is 1.39-1.45. Since the Polyimide film is widely used in various industries, different industries will have different requirements for the optical density values as well as the light transmittance.
http://www.shunxuan-pi.com/pol....yimide-film/red-poly

API and raw material are often confused due to the similar usage of the two terms. What is the difference? Raw material refers to chemical compounds that are used as a base to make an API. The API is not made by only one reaction from the raw materials but rather it becomes an API via several chemical compounds. The chemical compound which is in the process of becoming an API from a raw material is called an intermediate.
http://www.nmn-bio.com/biological-api/