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What is blood?
The heart pumps roughly 2,000 gallons of blood around the body each day. Human blood has three distinct parts: plasma, white blood cells and platelets, and red blood cells (watch 101). In general, blood ferries oxygen, nutrients, and hormones to cells in need while regulating body temperature and collecting cellular waste and byproducts, such as carbon dioxide, for removal. Explore its functions here.
In adult humans, bone marrow produces all the body's platelets and red blood cells, while other organs, including the spleen and lymph nodes, assist white cell production. Some of these organs also run quality control on blood cells.
Red blood cells are covered in antigens, protein molecules that let the immune system know to boot anything that doesn't match. In humans, the type of antigens you have determines your blood type, leading to four main types (A, B, AB, and O). For blood transfusions, it's crucial that individuals receive blood of their type, or their immune system will reject the donated blood.
... Read our full deep dive on blood here.
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> The history of drinking blood for health reasons. (More)
> Can we synthesize blood instead of requiring donations? (More)
> How blood pressure works. (More)
The Master of Suspense
Alfred Hitchcock, 101
Alfred Hitchcock is one of the most influential movie directors of all time. He was the director of more than 50 films and also the host and producer of an American television anthology series.
Hitchcock blended the macabre with gallows humor, sexual innuendo, and terror. He also frequently appeared in his own films. Born in Great Britain in 1899 (see timeline), his six-decade career produced many films now considered classics and helped legitimize the thriller genre.
Nine Hitchcock movies have been inducted into the National Film Registry, and four of them are listed in the American Film Institute’s list of the most important American movies (see list). Hitchcock has influenced generations of filmmakers (like "The Sixth Sense" director M. Night Shyamalan), employing iconic soundtracks, popularizing tropes like the MacGuffin, and innovating camera techniques.
... Read our full deep dive on Hitchcock here.
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> What is a "Hitchcock Blonde"? (More)
> How Hitchcock's "Psycho" broke all the rules. (More)
> A visual guide to Hitchcockian motifs. (More)
'The Gift of the Nile'
Everything to know about ancient Egypt
Historians divide Egypt's timeline into three kingdoms: Old, Middle, and New. A long, broken line of kings further divides its timeline into 31 dynasties. Its history was mostly forgotten until the late 18th century, when Napoleon's armies plundered its treasures and jump-started an "Egyptomania" that endures today (watch 101).
The vast, complex culture ebbed and flowed on the 4,000-mile-long, north-flowing Nile River, whose predictable annual flooding—caused by snowmelt and rains in the Ethiopian highlands—nourished its banks.
Egyptian power began and ended with the all-powerful pharaoh, a Greek term meaning "great house," which only became common usage in modern times. At death, Egyptians believed a person's spiritual parts were separated from the body but required the physical remains or a replica as a place to live. This belief gave rise to mummification (how it works) and extravagant tomb-making.
... Read our full deep dive on ancient Egypt here.
Also, check out ...
> How "The Book of the Dead" is a guide for the underworld. (More)
> An interactive map of ancient Egypt's wonders. (More)
> Two hundred years ago, the Rosetta Stone cracked hieroglyphics. (More)
Everything to know about ancient Egypt
Historians divide Egypt's timeline into three kingdoms: Old, Middle, and New. A long, broken line of kings further divides its timeline into 31 dynasties. Its history was mostly forgotten until the late 18th century, when Napoleon's armies plundered its treasures and jump-started an "Egyptomania" that endures today (watch 101).
The vast, complex culture ebbed and flowed on the 4,000-mile-long, north-flowing Nile River, whose predictable annual flooding—caused by snowmelt and rains in the Ethiopian highlands—nourished its banks.
Egyptian power began and ended with the all-powerful pharaoh, a Greek term meaning "great house," which only became common usage in modern times. At death, Egyptians believed a person's spiritual parts were separated from the body but required the physical remains or a replica as a place to live. This belief gave rise to mummification (how it works) and extravagant tomb-making.
... Read our full deep dive on ancient Egypt here.
Also, check out ...
> How "The Book of the Dead" is a guide for the underworld. (More)
> An interactive map of ancient Egypt's wonders. (More)
> Two hundred years ago, the Rosetta Stone cracked hieroglyphics. (More)
SOURCE: 1440 NEWS
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