California is a state in the Western region of the United States. It borders Oregon to the north, Nevada and Arizona to the east, and the Mexican state of Baja California to the south; it has a coastline along the Pacific Ocean to the west. With over 38.9 million...
Rome is the capital city of Italy. It is also the capital of the Lazio region, the centre of the Metropolitan City of Rome, and a special comune named Comune di Roma Capitale. metropolitan city in Italy. Its metropolitan area is the third-most populous within Italy....
Montréal is the largest city in Canada's Québec province. It’s set on an island in the Saint Lawrence River and named after Mt. Royal, the triple-peaked hill at its heart. Its boroughs, many of which were once independent cities, include neighbourhoods ranging from...
Munich , Bavaria’s capital, is home to centuries-old buildings and numerous museums. The city is known for its annual Oktoberfest celebration and its beer halls, including the famed Hofbräuhaus, founded in 1589. In the Altstadt (Old Town), central Marienplatz square...
Washington, officially the State of Washington, is a state in the Pacific Northwest region of the Western United States.Washington is the 18th-largest state, with an area of 71,362 square miles (184,830 km2), and the 13th-most populous state, with more than 7.7...
Ottawa is Canada’s capital, in the east of southern Ontario, near the city of Montréal and the U.S. border. Sitting on the Ottawa River, it has at its centre Parliament Hill, with grand Victorian architecture and museums such as the National Gallery of Canada, with...
Sofia is the capital and largest city of Bulgaria. It is situated in the Sofia Valley at the foot of the Vitosha mountain in the western parts of the country. The city is built west of the Iskar river, and has many mineral springs, such as the Sofia Central Mineral...
Warsaw, officially the Capital City of Warsaw, is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland. Its population is officially estimated at 1.86 million residents within a greater metropolitan area of 3.1...
he Americas, which are sometimes collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. Along with their associated islands, the...
Greece is a country in southeastern Europe with thousands of islands throughout the Aegean and Ionian seas. Influential in ancient times, it's often called the cradle of Western civilization. Athens, its capital, retains landmarks including the 5th-century B.C....
Alberta is a province in Western Canada. Its landscape encompasses mountains, prairies, desert badlands and vast coniferous forests. It has more than 600 lakes, and rich mineral deposits. In the west, the Canadian Rocky Mountain Parks have glaciers in the Columbia...
Vancouver, a bustling west coast seaport in British Columbia, is among Canada’s densest, most ethnically diverse cities. A popular filming location, it’s surrounded by mountains, and also has thriving art, theatre and music scenes. Vancouver Art Gallery is known for...
Cryptographer David Chaum first proposed a blockchain-like protocol in his 1982 dissertation "Computer Systems Established, Maintained, and Trusted by Mutually Suspicious Groups."Further work on a cryptographically secured chain of blocks was described in 1991 by...
The lumbar spine contains a total of 5 intervertebral discs situated between the vertebral bodies. The primary functions of these discs are to1: Distribute compressive loads placed on the spine, providing shock absorption properties. Maintain the distance between the...
Texas is a state in the South Central region of the United States. At 268,596 square miles, and with more than 30 million residents in 2022, it is the second-largest U.S. state by both area and population. Houston is the most populous city in Texas and the...