Education and information

2) HTML5 and CSS Fundamentals Learn how to build Web sites using HTML5 and basic CSS, directly from W3C, creator of the latest Web standards.

3) Programming for Everybody (Getting Started with Python)

4) Introduction to Data Science Learn about the world of data science first-hand from real data scientists.

5) Statistical Thinking for Data Science and Analytics Learn how statistics plays a central role in the data science approach.

Saturday, January 22, 2022

Learn Online How to Code from University of British Columbia

This programming course takes a unique approach, as it focuses on learning a systematic programming method rather than a programming language. This practical approach will help you channel your creativity so that you can program well in any language.

You will learn techniques to:

Develop program requirements

Produce programs with consistent structure that are easy to modify later

Make your programs more reliable by building tests as an integral part of the programming process.

This course concludes with the design of a simple interactive game.

Learners who enroll in the Verified track will receive staff grading for the course project and increased interaction with the instructor and staff.

Most Popular Online Courses of MIT, Harvard University, IBM, University of California, ...

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Micromasters^®

Programs

MicroMasters programs are a series of graduate level courses from top universities designed to advance your career. They provide deep learning in a specific career field and are recognized by employers for their real job relevance. Students may apply to the university offering credit for the MicroMasters program certificate and, if accepted, can pursue an accelerated and less expensive Master’s Degree.

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MicroBachelors^®

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MicroBachelors programs are built for adult learners looking to progress their career. Created by top universities and influenced by Fortune 1000 companies, edX’s MicroBachelors programs are the only path to a Bachelor’s degree that make you job-ready today and credentialed along the way.

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Wednesday, February 10, 2021

How is a rainbow formed ? | Natural Hub

The Sun and a wet weather are the main components of the Rainbow. When the sunlight with its white light rays cross the water drops, the different colours that constitute the white light split up, to be scientifically accurate, the colours are refracted, thus forming a rainbow. White light is refracted through the drops of water which displays all the colours, but the human eye can only see one colour per drop, and that is why the height of the drops is a crucial determinant in the order of the colours which is always respected. The highest drops to the outside allow us to see red, while the lowest drops inward allow us to see purple. Between red and purple, we see the orange, yellow, green, blue and indigo colours in that order which makes the seven colours of the rainbow. The more the drops of water are big, the more the rainbow is colorful. Nature never ceases to amaze us, we need to uncover its mysteries that surround us...

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How much does a cloud weigh ? | Natural Hub

Clouds come in many forms and weights.

A weight that depends on three essential factors : size, temperature and the water content called density.

Scientists estimate that a small cloud can weigh more than 500 tons of water.

But what’s frightening is the clouds that cause thunder, they can reach a weight of 500,000 tons and even more in regions where rainfall is intense, such as tropical areas.

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How is rain formed ? | Natural Hub

The liquid precipitation from the sky, called rain, is the result of the evaporation of moisture that exists in nature and specifically in different sources of liquid such as seas, lakes, rivers, oceans...

Clouds form when evaporated water is condensed into liquid water. The presence of small particles in the air facilitates and helps the formation of droplets and that’s how a cloud is formed.

The inside of a cloud composed of a mixture of moist air and water droplets is the scene of several formations, droplets move at different speeds and multiple directions, sometimes colliding with each other, and that is how the droplet increase in size and bigger drops are formed.

Once, the drops are large enough, Earth's gravity takes over and the drops fall on the surface of the Earth as precipitation, namely rain.

The rain is a blessing from heaven, and especially after a dry season.

Our water supplies depend on precipitation and especially our crops.

Water is a source of life, we must take good care of it.

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Where does the colours of the sky come from at sunset ? | Natural Hub

Sunset is a magical moment that reveals one of nature's wonders.

Why does the sky lose its blue colour and give way to this red-orange one that we are so fascinated about?

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Tuesday, February 9, 2021

Views of psychoanalyst on Racism

Awareness of racism increased as Black Lives Matter protests spread across the country last summer. In response, psychoanalysts suggest three ways to change attitudes about race — curiosity, courage, and building intimate relationships with others.Curiosity starts with self-education and self- reflection to better understand our beliefs as well as talking to others about ethnicity and racism.Courage is necessary to confront our own unacknowledged biases and recognize where some of them come from, including our upbringing or involvement in various groups, or from society at large.Finally, one of the most profound ways of changing attitudes about others is engaging in close relationships with people from other ethnicities. Building and maintaining relationships with individuals of differing backgrounds allows recognition of our common humanity and shared struggles.However, experts point out that being aware of, acknowledging, and changing deeply-ingrained racist ways of thinking is difficult and takes time and effort.The human mind resists change to protect our self-esteem from uncomfortable truths, and our minds unconsciously work diligently to avoid uncovering painful and distressing knowledge about ourselves. Even making change we know will make us feel better, such as exercising more, can be hard to initiate and sustain."Often, changes to how we think or do things require a shift in how we view ourselves, our needs, and our relationships," says Deeba Ashraf, MD, member of the American Psychoanalytic Association (APsaA).

"And changing attitudes about race can be especially hard because these attitudes are usually learned when we are very young."Beverly J. Stoute, a child and adolescent psychoanalyst and psychiatrist, says children develop awareness of and curiosity about racial differences early.

"As children grow, parents, teachers, media representations, and interactions with different groups can either powerfully facilitate or thwart children’s openness to racial and ethnic differences," said Dr. Stoute, also a member of APsaA.There are many ways we try to protect ourselves from painful feelings or unwanted truths about our own beliefs. One way is by asserting that unpleasant truths are not real, otherwise known as denial. Another way is to imagine these "horrible truths" only exist in others and not in ourselves.

This is called projection and it involves attributing qualities like laziness or criminality to a particular group; while overlooking how these traits might apply to ourselves, or those in our own group.Hence, "group identity," also presents a challenge to changing attitudes about racism. Being part of a group can offer a sense of connection and protection, and in some cases, prestige. Many group identity attitudes are passed on from generation to generation, but also part of ongoing relationships with others who share the same ideas. Trying to change an entrenched attitude can result in group members feeling threatened or fearing a loss of group membership, according to APsaA experts.

Yet, when people can break through these unconscious ways of protecting their self-image, they may recognize the costs of racism and look at the loss and pain it inflicts on oneself and others. It may be possible to reevaluate one’s own ideas of what is healthy and growth-oriented.

This process can be difficult, but managing the discomfort these efforts provoke can motivate a desire to change, psychoanalysts say."I am reminded of a quote from James Baldwin, ‘People can cry much easier than they can change’," says Ebony Dennis, PsyD, clinical psychologist and psychoanalyst who is also an APsaA member. "Changing attitudes about racism will take time and effort, and occasionally some hurt feelings. But it is through these growing pains that real, lasting change happens."

At what temperature wood burns ? | Natural Hub

Self-ignition of materials without external ignition source differs from one material to another.

For wood, its self-ignition point is 300° C.

Heated to this temperature, wood releases hydrocarbons which when mixed with atmospheric oxygen causes a reaction that ignites wood.

To cite just one example, cotton has a higher resistance which is located around 407° C.

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What’s a lightning bolt ? | Natural Hub

During bad weather, children and adults alike dread the deafening sound of thunder when they see lightning in the sky.

This climatic phenomenon happens during storms.

Huge masses of air move and gain electricity charge by friction resulting in the accumulation of several charges in the huge black clouds.

The water molecules go up and get positive charges while the heavy water molecules remain at the base and get negative charges.

When the electrical load is too large, a discharge of lightning occurs between the areas of opposite charges, causing a huge spark and thus lightning in all its beauty is formed.

Lightning can occur between clouds and the ground or inside the cloud in several forms, it can be branched, fulminated or sinuous...

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Can a drought trigger a flood ? | Natural Hub

Drought can be one of the essential causes of the floods if, and only if, it is followed by heavy rains.

Drought drains rivers and lakes, of which the soil becomes dry and solid.

The large amounts of water from heavy rain accumulates on the surface of the earth and is unable to infiltrate the soil, resulting in areas submerged by water which leads to the flood.

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Monday, February 8, 2021

The Icebergs and their secrets | Natural Hub

An iceberg is a block of ice floating on the surface of the ocean, seas, and even lakes. This glacier, which can range in size from a few centimeters to several thousand kilometers long, has broken away from the mainland in the polar regions, splits and drifts over vast expanses of water as the sea currents and winds flow. An iceberg is caused by the accumulation and settlement of snow on the mountains and glaciers in the pack ice over thousands of years. Most icebergs are made up of fresh water that takes a long time to thaw, which is why they melt very slowly and last quite a long time. The iceberg always occurs as a visible area above the water, the emerged surface represents only 10% of the block and it is the submerged area that represents 90% that is the most dangerous, given its quite different shapes. A cautionary saying : only the tip of the iceberg is known.

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What is a volcano ? | Natural Hub

Thousands of kilometers underground, it is very hot, so hot that the rock melts away from its organic state to its liquid state.

The liquid flowing from the rocks and mixing with different gases that the earth abounds in, forms magma.

The magma, an essential component in the formation of a volcano, travels tens of kilometers from the earth's surface, creating a pathway through the cracks caused by warming in the Earth's crust.

The accumulation of magma forms the magma chamber, which can remain at rest for decades, but under the effect of a large number of molten rocks, the magma pushes the ceiling to the surface and then turns into a volcanic eruption.

When it reaches the surface, the very hot magma in contact with much colder air becomes thicker and forms the lava that flows through the volcano and gradually cools and turns into rock.

The volcano can be on land or underwater.

It is very dangerous and quite destructive and examples in history are numerous...

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Sunday, February 7, 2021

What is a solar eclipse ? | Natural Hub

In the universe, everything is in motion.

The moon revolves around the earth, which itself revolves around the sun.

An eclipse is the alignment of the sun, moon and earth with the moon in the middle.

At this precise moment, the sun is hidden by the moon and its light does not reach the earth, so the inhabitants who are in this alignment will then observe the dark side of the moon, this is the extraordinary phenomenon of the solar eclipse that we do not have the chance to see often and which only lasts for a short time since the main actors are always in motion, namely : the Sun, the Moon and the Earth.

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Why do trees lose their leaves in autumn ? | Natural Hub

Nature has given trees the means to defend themselves against bad weather, but is that enough?

Trees in autumn adapt to the cold, the trunk protected by the bark, the roots by the soil, only the leaves are confronted with the rigor of the climate.

The drop in temperature and the decrease in warmth time mean that the leaves no longer receive sap, which is an essential nutrient for the survival of the leaves.

The leaves then feed on their provisions, before dehydrating, hardening and eventually falling.

The color of the leaves deteriorates as the sunlight is reduced, which mainly influences deciduous leaves.

Unlike deciduous leaves, evergreen leaves in conifers such as pine, cedar or spruce keep their leaves because they are needle-shaped or flake-shaped and have much smaller exposure surfaces.

Deciduous leaves are more allergic to cold than evergreens, which resist better by keeping their autumn robes.

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