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A circadian rhythm is an internal biological cycle that runs on roughly a 24-hour schedule. It helps living things coordinate sleep, alertness, hormones, body temperature, digestion, and other processes with the daily pattern of light and darkness.
Chichen Itza is a major ancient Maya city in Yucatan, Mexico, known for the Pyramid of Kukulkan, ceremonial platforms, a vast ball court, sacred cenotes, and a layered history of Maya power, trade, ritual, and outside influence.
Central banks are public institutions that manage money, influence credit conditions, support payment systems, and help safeguard financial stability. Their exact powers differ by country, but they often play a central role in inflation, interest rates, banking, and crisis response.
Cats are small domesticated felines whose hunting instincts, flexible social behavior, and long relationship with people have made them one of the worldโ€s most familiar companion animals.
The carbon cycle is the movement and storage of carbon through the atmosphere, oceans, rocks, soils, living organisms, and human systems, linking life, climate, geology, energy, and the chemistry of Earth.
Carbon capture refers to technologies that separate carbon dioxide from industrial exhaust, power generation, fuel production, or sometimes directly from the air. Captured CO2 can be compressed, transported, used in products, or stored deep underground. It can help cut some hard-to-abate emissions, but it also raises questions about cost, energy use, storage integrity, equity, and fossil fuel lock-in.
The Byzantine Empire was the eastern continuation of the Roman Empire, centered on Constantinople. It survived for nearly a thousand years after the fall of the western Roman imperial court, preserving Roman law, developing Greek-speaking Christian culture, defending key trade routes, and shaping Orthodox Christianity, art, diplomacy, and medieval politics.
Broadcom is a diversified technology company that sells semiconductor products and infrastructure software, including networking chips, broadband components, storage connectivity, custom silicon, security software, and VMware virtualization and cloud infrastructure products.
Borobudur is a monumental Buddhist temple in Central Java, Indonesia, built in the 8th and 9th centuries and designed as a stepped journey through Buddhist cosmology, with terraces, relief panels, Buddha statues, and openwork stupas.
Booking Holdings is the online travel company behind Booking.com, Priceline, Agoda, KAYAK, OpenTable, and related travel brands. Its official site, bookingholdings.com, presents the corporate portfolio, while its consumer brands connect travelers, lodging partners, airlines, rental-car providers, restaurants, and activity operators through search, booking, payments, advertising, mobile apps, and trip-support technology.
Bluetooth is a short-range wireless technology standard for connecting nearby devices directly. It is used in headphones, speakers, keyboards, cars, wearables, medical devices, sensors, and many other personal-area network products.
A blockchain is a type of distributed ledger that stores records in linked blocks across a network of computers. It uses cryptography and consensus rules so participants can agree on a shared history without relying on one central database. Blockchains power cryptocurrencies, but they can also support smart contracts, digital assets, audit trails, and coordination between parties that do not fully trust one another.
Block is a financial technology company known for Square merchant payments, Cash App, point-of-sale tools, peer-to-peer transfers, small-business software, cards, lending, Bitcoin initiatives, and commerce tools for sellers and consumers.
Black holes are regions of spacetime where gravity is so strong that nothing crossing the event horizon can escape, formed by collapsed massive stars, mergers, or the growth of enormous compact objects in galactic centers.
The Black Death was a devastating plague pandemic that swept through Europe, the Mediterranean, and nearby regions in the mid-fourteenth century. Caused by the bacterium Yersinia pestis, it killed millions of people, disrupted trade and families, intensified persecution, and changed labor, religion, medicine, and politics.
Bioluminescence is light made by living organisms through chemical reactions. It helps some animals find mates, attract prey, confuse predators, communicate in darkness, and reveal how chemistry, ecology, and evolution can turn energy into visible signals.
Behavioral economics studies how real people make economic decisions when attention, emotion, habits, social context, limited information, and cognitive biases shape choices. It combines economics with psychology to explain behavior that standard models often miss.
Battery storage saves electricity for later use by converting it into chemical energy and releasing it back when needed. From phones and electric vehicles to home batteries and grid-scale systems, batteries help balance solar and wind, provide backup power, stabilize grids, and raise new questions about minerals, safety, recycling, cost, and access.
Atlassian is a technology company that builds collaboration and productivity software for software teams, IT teams, business teams, and knowledge workers, with products including Jira, Confluence, Trello, Loom, Bitbucket, and Rovo.
ASML is a Dutch semiconductor equipment company best known for lithography systems, especially extreme ultraviolet machines used by leading chip manufacturers to print the tiny patterns required for advanced processors, memory, and AI chips.
Artificial satellites are human-made spacecraft placed in orbit around Earth or another body. Since Sputnik 1 in 1957, satellites have become part of daily infrastructure, supporting weather forecasts, television, internet links, GPS navigation, climate monitoring, disaster response, scientific research, and national security.
Artificial intelligence is the field of building computer systems that can learn patterns, make predictions, generate content, recommend actions, understand language, perceive images, automate tasks, and support decisions across software, science, business, health, education, and everyday life.
Apple is a global technology company known for iPhone, Mac, iPad, Apple Watch, AirPods, Apple Vision Pro, Apple Silicon, the App Store, subscription services, privacy-focused design, and Apple Intelligence features across its device ecosystem.
Antibiotic resistance happens when bacteria evolve or acquire ways to survive drugs that once controlled them, making infections harder to treat and threatening surgery, cancer care, intensive care, childbirth, and other parts of modern medicine that depend on effective antibiotics.
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