ตรวจ หวย 1 มกราคม 2563 ย้อน หลัง
Encyclopedia Categories
Today in context,
March 4, 2021
Do You Know These Women?
In honor of Women’s History Month, we’re highlighting a few female trailblazers whose stories aren’t as well known as we think they should be.
Hypatia
She was perhaps the first female mathematician of note and a leading intellect in the ancient world. However, in 415 a mob of Christian zealots brutally murdered her, believing she supported paganism.
Bessie Coleman
She broke barriers for both women and African Americans in the field of aviation. Unable to become a commercial pilot, she was a star of early air shows until her death in 1926.
Wuhou
She rose from concubinage to become the only female monarch to rule China. During her reign as empress (690–705), she unified the country and made numerous reforms.
Dorothea Dix
In the 19th century, this American reformer sought to improve the treatment of the mentally ill, leading to widespread reforms, especially in prisons.
Happy Birthday, Chicago!
On March 4, 1837, Chicago was incorporated as a city, with a population of about 4,200. Full of contrasts, Chicago is the city of the humble immigrant and the new millionaire, the home of brazen criminals such as Al Capone and of great humanitarians such as settlement-house pioneer Jane Addams. Horrific public housing high-rises coexist with innovative architecture and the beautiful Gold Coast lakefront neighborhood. Poet Carl Sandburg hailed Chicago as the “city of the big shoulders,” cunning and cruel, yet creative and strangely attractive. For all its contradictions, Chicago has been Encyclop?dia Britannica's headquarters since the 1930s, and we say Chicago is second to none.
Podcasts
See All Shows And Podcasts
Botanize!
Botanize!, hosted by Melissa Petruzzello, is a podcast that will introduce you to some of the world’s most remarkable plants, fungi, and algae. These overlooked organisms have fascinating evolutionary stories to tell about survival, exploitation, adaptation, and general scrappiness, and every episode will pique your curiosity. From parasitic plants to kelp forests, Botanize! aims to showcase some of Earth’s finest nonanimal life-forms and their brilliant ecologies.

Postcards from the 6th Mass Extinction
So far there have been five notable mass extinctions on Earth. A growing number of scientists argue that we’re now in the midst of a sixth. Postcards from the 6th Mass Extinction is a podcast hosted by John P. Rafferty that attempts to personalize extinction, emphasizing the survival challenges that familiar forms of life currently face, while at the same time considering the pivotal roles they play in their own ecosystems.

On This Day
Hear the stories that propelled us to the present day through insights that lend perspective to our world with a nod to our own humanity. Britannica media editor Kurt Heintz, together with Emily Goldstein and Meg Matthias, is on a mission to spotlight poignant and noteworthy events for every day of the year.
The Wives of Windsor

Catherine, duchess of Cambridge
Catherine is married to Prince William, the elder son of Prince Charles and Princess Diana and the second in line to the British throne.

Meghan, duchess of Sussex
The duchess formerly known as Meghan Markle put her acting career on hold when she married Prince Harry, Charles and Diana’s younger son.
Browse by Category

Entertainment and leisure activities have been a part of all cultures in one form or another since the ancient times, whether the activity in question involved participating in a dance performance, attending a Broadway show, going to a music festival, or watching a movie.
Featured
- Stringed instrument
-
Academy Awards
We’ve rolled out the red carpet for you. Test your...
-
Fantasy Lands
Can you tell Middle-earth from Outer Rim? Match the...

Planet Earth contains some extraordinarily diverse environments, some of which are easily habitable and some not so much. In different areas of Earth, one might find sweltering deserts, dense tropical rainforests, or bone-chilling tundras. Each biome and habitat comes with its own selection of flora and fauna, and it may include physical features such as canyons, volcanoes, rivers, or caves. Human beings have built homes in many different environments, settling the area and organizing it into units such as cities, states, regions, and countries, each with its own points of interest. Shifting trends in human migration have resulted in a human geography that is profoundly different from that of centuries ago.
Featured
- River
-
A Capital Idea
The city or town that functions as the seat of government...
-
The Largest Islands in the World
Big, bigger, biggest.

The study of the human mind and body, how these function, and how they interact—not only with each other but also with their environment—has been of utmost importance in ensuring human well-being. Research on potential treatments and preventive medicine has expanded greatly with the development of modern medicine, and a network of disciplines, including such fields as genetics, psychology, and nutrition, aims to facilitate the betterment of our health.
Featured
- Mental disorder
-
How Radioactive Isotopes are Used in Medicine
Radioactive isotopes have a variety of applications...
-
How Is Inflammation Involved in Swelling?
Ever wonder why your skin becomes red and hot and swells...

It's easy enough to agree that human beings all around the world have certain basic requirements that must be fulfilled in order to ensure their individual and collective well-being. History has shown us, however, that it's not so easy to form societies or communities that fulfill these requirements for all members. The fight over human and civil rights has persisted for hundreds of years and remains alive today, both within the borders of nations and on an international scale. It has led to large-scale social movements and reforms concerning issues such as suffrage, slavery, women's rights, racial discrimination, environmentalism, gay rights, and more.
Featured
- Modernization
-
5 Things People See in the Moon
When you look up at our faithful satellite, what do...
-
What Is Gaslighting?
Is someone you know gaslighting you?

With the development of language, the human imagination has found a way to create and communicate through the written word. A literary work can transport us into a fictional, fantastic new world, describe a fleeting feeling, or simply give us a picture of the past through novels, poems, tragedies, epic works, and other genres. Through literature, communication becomes an art, and it can bridge and bond people and cultures of different languages and backgrounds.
Featured
- Portuguese literature
-
Indian Literature: Fact or Fiction?
You may be familiar with Rudyard Kipling’s The...
-
Famous Writers: Fact or Fiction?
From the Italian Renaissance and Victorian era to India...

Humans have long pondered not only how we came to be but also why we came to be. The earliest Greek philosophers focused their attention upon the origin and nature of the physical world; later philosophers have theorized about the nature of knowledge, truth, good and evil, love, friendship, and much more. Thus, philosophy involves a methodical assessment of any and all aspects of human existence and experience. The realms of philosophy and religion have sometimes intersected in conducting inquiries such as these. As with philosophy, the study of religion underscores how humankind has long speculated about its origins. The possibility of a higher being (or beings) to which livings things owe their existence has long captived human thought. Many religions also offer their own views on the nature of good and evil, and they may prescribe guidelines and judgment on different kinds of human behavior.
Featured
- Philosophy of mind
-
The Sinking of the Titanic
The sinking of the Titanic is one of the most...
-
Roman Catholic Religious Dress
In its long history, Roman Catholicism has amassed...

The world today is divided territorially into more than 190 countries, each of which possesses a national government that claims to exercise sovereignty and seeks to compel obedience to its will by its citizens. Governments can be classified in any number of ways. For example, they might be classified by the number of rulers, thus distinguishing government by one (as in a monarchy or a tyranny) from government by the few (in an aristocracy or oligarchy) and from government by the many (as in a democracy). Governments can also be classified by mode of succession; for example, ascension to governmental leadership may follow the rules of hereditary succession, or it may be determined through elections or by force. Governments also vary in terms of the laws and rules of conduct that each political entity follows.
Featured
-
Slavery
sociology
-
Corporate Collapses and Scandals
This wordsearch challenge marks some of the biggest...
-
Accounting Scandals of All Time
This wordsearch challenge marks some of the biggest...

How can the sky be blue one day and stormy the next? Why do heavy objects tend to fall downwards when dropped? How are birds able to fly (and why can’t I do the same?)? Human beings have long been curious about the world in which we live, striving to identify connections among the phenomenons we witness and to understand how it all works. The field of science has developed over many centuries as a way of studying and understanding the world, beginning with the primitive stage of simply noting important regularities in nature and continuing through the rise of modern science. The modern-day sciences cover a vast range of fields, including biology, chemistry, meteorology, astronomy, physics, and much more.
Featured
- Principles of physical science
-
Pollution
The pollution of Earth’s waterways, land, and atmosphere...
-
Is Light Pollution Really Pollution?
Is Light Pollution Really Pollution?

Physical contests and recreational games have long played a part in human society. In both team and solo sports, the human body has been pushed to its limits in the name of improving athletic performance and to break record upon record. The ancient Olympic Games are an early example of the contests in which humans have engaged to showcase physical prowess. In modern times, sports and games have evolved into a lucrative and competitive industry, while other leisure activities, such as card and video games, can be competitive or can just be a way to unwind or socialize.
Featured
-
Poker
card game
-
How Are Sports Chosen for the Olympics?
The ins and outs of what’s in and what’s out.
-
What Is a Modern Pentathlon?
Grab a sword, a swimsuit, a horse, a gun, and running...

Humankind has long striven to improve its living conditions through the development of tools, instruments, and transportation and communications systems, all with the goal of making our lives easier, more productive and—why not—more fun, too! Thanks to human curiosity and technological research, many significant inventions have been made throughout history that in turn made a difference in our daily lives.
Featured
-
Construction
building
-
Internet Firsts: Fact or Fiction?
You may fancy yourself a denizen of the internet, but...
-
What Comes After Terabyte?
Kilo-, mega-, giga-, tera-, ???

These are the arts that meet the eye and evoke an emotion through an expression of skill and imagination. They include the most ancient forms, such as painting and drawing, and the arts that were born thanks to the development of technology, like sculpture, printmaking, photography, and installation art, the latter a combination of multiple creative expressions. Though beauty is in the eye of the beholder, different eras in art history have had their own principles to define beauty, from the richly ornamented taste of the Baroque to the simple, utilitarian style of the Prairie School.
Featured
-
Scottish Enlightenment
British history
-
5 Revealing Paintings by Caravaggio
Learn before you look.
-
14 Significant Paintings at Nationalmuseum in Sweden
Learn before you look.

Does history really repeat itself, or can we learn from the mistakes of those who came before us? History provides a chronological, statistical, and cultural record of the events, people, and movements that have made an impact on humankind and the world at large throughout the ages. Investigating the causes and results of past events is critically important in gaining a full understanding and perspective of present-day issues.
Featured
-
Thirty Years' War
European history
-
Disasters of Historic Proportion
You may have experienced the common cold, but do you...
-
European History
What was the name of Franz Ferdinand’s assassin? Who...
More From Britannica
ProCon.org
Award-winning ProCon.org promotes critical thinking, education, and informed citizenship by presenting the pro and con arguments to controversial issues in a straightforward, nonpartisan, freely accessible way.
Britannica Beyond
Questions are an important way for people to learn concepts, to solve problems, and to challenge ideas. We’ve created a new place where questions are at the center of our learning. Go ahead. Ask. We won’t mind.
Advocacy for Animals
Presenting Advocacy for Animals, a blog focused primarily on animal rights, wildlife conservation, environmental health and safety, and the legal and cultural issues related to these topics. This blog is a source of information and a call to action. It is meant to be a provocation and a stimulus to thought regarding humanity’s relationship with nonhuman animals.
Alain Elkann Interviews
Alain has been writing a weekly interview column for the Italian newspaper La Stampa since 1989. His interviews celebrate some of the best known and successful personalities of the present day.