Britannica Companions

Mount Everest (Mt. Everest, mountains, Himalayas).
Is Mount Everest Really the Tallest Mountain in the World?
Close-up of marijuana plant growing outdoors
What Is the Difference Between Hemp and Marijuana?
Close up of green grass
Why Is Grass Green?
African American man praying in church with stained glass in background
Why Do People Say “Amen” at the End of a Prayer?
Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,
Which Religion Is the Oldest?
This image depicts a 3-day average of actual sea surface temperatures for the Caribbean Sea and Atlantic Ocean, from August 25-27, 2005 during Hurricane Katrina, with 2005 hurricane season names overlaid
How Do Hurricanes Get Their Names?
Feed corn ready for harvest after drying in the field, Kings Hill County, Virginia. Agriculture food grain cereal corncob
18 Food Crops Developed in the Americas
Chemical equations Chemical reactions chemistry
How Do You Balance a Chemical Equation?
Deck chairs under a beach umbrella.
When Does Summer Start?
Shot of a woman drinking a glass of water at home. Drink sip hydration
How Much Water Should a Person Drink in a Day?
Measuring body fat with calipers. (BMI, body mass index, weight)
How Is BMI Calculated?
"George Washington before the Battle of Trenton" oil on canvas by John Trumbull, c. 1792-94; in the collection of The Metropolitan Museum of Art, New York City.
The Plot to Assassinate George Washington
Family tree of the animal kingdom. Called a phylogenetic tree by scientists, depicts representatives of 21 great groups, called phyla, and how they are related to one another. zoology
How Do You Read Phylogenetic Trees?
Person paying with a credit card using a credit card terminal. Cashless payment, credit card reader
What Is a Cashless Society and How Does It Work?
Sledgehammer breaking rocks. (demolishing, crushing, blurred motion)
Can Anything Break if You Hit It Hard Enough?
Close-up of a dog turning around and about to lie down. (animals, dogs, pets).
Why Do Dogs Circle Before They Lie Down?
Peregrine falcon in flight
What Is the Most Aerodynamic Animal?
Studio portrait of young Black woman with arms folded
Why Do Our Noses Have Two Nostrils?
Super Typhoon Noru over the western tropical Pacific Ocean as observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA Aqua satellite July 31 2017
What Is the Difference Between a Typhoon and a Super Typhoon?
Space, Sun and planet Earth. Western hemisphere. This image elements furnished by NASA.
Why Does the Tropic of Cancer's Location on Earth Move Over Time?
Products from aluminum, copper, bronze, and brass on a white background. (metals)
Why Are Some Metals More Conductive than Others?
Hurricane Irma seen striking Miami, Florida with 100+ mph winds and destructive storm surge.
What Is the Difference Between a Meteotsunami, a Seiche, and a Storm Surge?
Composite image - Katsushika Hokusai The Great Wave off Kanagawa, color woodcut print, with background of Seismograph recording seismic activity and detecting an earthquake
How Do Scientists Predict Tsunamis After Earthquakes?
Volcanic eruption of a volcano near Antigua, Guatemala
What Causes a Volcano to Erupt?
Periplaneta americana (american cockroach, waterbug, palmetto bug)
How Do Cockroaches Breathe?
Thermal image portrait of mid adult woman with raised hands
How Does the Human Body Maintain Its Temperature?
Digital image of the Western Hemisphere (Earth, Blue Marble) at the time of one of the strongest hurricanes (Hurricane Linda) ever observed in the Eastern Pacific. Moon is an artistic addition. (Data date: 2000)
How Old Is Earth?
Leonardo da Vinci's Salvator Mundi on show at Christies' Kings Street, before it is offered at auction by Christie's New York
Why Is the Salvator Mundi Called the World’s Most Controversial Painting?
Tyrannosaurus Rex attacking two Struthiomimus dinosaurs.
How Do We Know What Dinosaurs Sounded Like?
A tornado in rural Iowa sweeps dangerously near a farm. Weather storm
Why Does the United States Have More Tornadoes than Any Other Country?
DNA strands on blue background
What Is the Difference Between DNA and RNA?
Water sits in a macro at a a restored wetland area in Starke County, Indiana May 25, 2021. The area is enrolled in the NRCS' Wetland Reserve Easement Program. The easement includes 200.6 acres of former cropland that were restored to create wetland, prairie and forest habitat for wildlife. The purpose of the macros is to provide habit and food to a variety of animals including migrating waterfowl, while returning the landscape to its natural appearance prior to the installation of drainage for agriculture and urban development.
How Do You Rewild an Environment?
Glowworm (Lampyris noctiluca); female glowing at night, Cornwall, England. (beetles, insects, glow worms)
How Do Glowworms Glow?
Two puppies and a kitten, puppy playfully biting kitten's head
Why Are the Babies of Mammals Cute?
A non-fungible token (NFT) is a special type of cryptographic token which represents something unique. NFT blockchain marketplace
What Is an NFT?
Magnifying glass focusing on Afghanistan, Pakistan and surrounding countries on world map
Where Did the -stan Country Name Suffix Come From?