Albumin is a protein made by the liver. It makes up about 60% of the total protein in the blood and plays many roles. It keeps fluid from leaking out of blood vessels; nourishes tissues; and transports hormones, vitamins, drugs, and ions like calcium throughout the body.
The Mayan and other Mesoamerican cultures used a vigesimal number system based on base 20 (and, to some extent, base 5), probably originally developed from counting on fingers and toes. The numerals consisted of only three symbols: zero, represented as a shell shape; one, a dot; and five, a bar.he Mayan civilisation had settled in the region of Central America from about 2000 BCE, although the so-called Classic Period stretches from about 250 CE to 900 CE.
Mayan pyramid. The Maya pyramids are structures built in the jungles of Central America by the Maya civilization between 200 and 900 AD. Unlike the straight sides of the more commonly known Egyptian pyramids, the sides of Maya pyramids arey steppedâsometimes for the purpose of enabling people to ascend to the top.