The squid
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Squids are carnivorous molluscs called cephalopods that have eight arms and gills with a circulatory system of three hearts. They range in size from sixteen centimeters to thirty metres long and while they lack ears, they have very good vision.
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William Henry Gates invented Microsoft Word and Windows. The document discusses the history and key details of Microsoft Word and Windows, including when and how they were invented. It notes that Charles Simonyi and Richard Brodie developed the first version of Microsoft Word in 1981 after being hired by Bill Gates and Paul Allen. The document also lists advantages and disadvantages of computer use and how tasks were performed before the inventions.
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The circulatory system transports oxygen, nutrients, hormones, and other materials to tissues and removes carbon dioxide and wastes. It consists of the heart, which is a hollow muscular organ about the size of a fist that pumps blood through the body, and a network of blood vessels - arteries, veins, and capillaries - that form a 100,000 km long system. Blood is a fluid that delivers oxygen and nutrients to cells from the lungs and heart and carries away carbon dioxide and other cellular wastes.
The excretory system power point
The document discusses the excretory system and its function of eliminating waste from the body. It describes the key parts of the excretory system as the kidneys, which filter waste from the blood and produce urine, the ureters which carry urine from the kidneys to the bladder, and the urethra which carries urine out of the body when the bladder contracts. The urinary tract works by filtering the blood in the kidneys, carrying the urine via the ureters to the bladder for storage, and then pushing the urine out of the body through the urethra when the bladder is full.
The excretory system
The excretory system removes waste from the body. It includes the kidneys, ureters, bladder, and urethra. The kidneys filter waste from the blood to produce urine. The ureters carry urine from the kidneys to the bladder. The bladder stores urine until it is released through the urethra. Drinking liquids is important when exercising or having a fever to replenish the water lost through urine production and sweat. The sweat glands are also part of the excretory system, releasing waste and salts through sweat on the skin.
The circulatory system
The circulatory system functions to transport oxygen, nutrients, hormones, and waste products throughout the body. It consists of the heart, blood vessels including arteries, capillaries and veins, and blood. The heart pumps blood through two circuits - pulmonary circulation to the lungs and systemic circulation to the rest of the body. Deoxygenated blood enters the heart's right side, is pumped to the lungs to receive oxygen, and enters the left side to be pumped through the body, where it releases oxygen and picks up carbon dioxide to be returned to the heart again.
Rabies vaccine
Louis Pasteur invented the first vaccine against rabies on July 6, 1885 in France. Prior to the vaccine, rabies was fatal for both humans and animals once symptoms appeared. While the vaccine had some side effects like fever and weakened younger dogs' ability to fight infection, its main advantage was that it could cure rabies. The first test of the vaccine was done on a 9-year old boy.
The history of computers
The document traces the history and evolution of computers from their origins in 1936 with the Z1 to recent developments after 2000. It discusses early pioneers like John Atanasoff, Clifford Berry and IBM. Home computers emerged in the late 1970s and the IBM PC revolutionized the consumer market in 1981. Microsoft created the MS-DOS operating system that same year. The document also outlines the development of laptop/notebook computers and peripherals over time as well as some curiosities in computer history including early games and the invention of the mouse and floppy disk. Potential disadvantages like cybercrime and protecting personal information online are also briefly covered.
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