What are three laws of motion?

Sir Isaac Newton's three laws of motion describe the motion of massive bodies and how they interact.

Presented in 1686, these three laws are:

1️⃣ Objects in motion or at rest remain in the same state unless an external force imposes change. It is the concept of inertia.

2️⃣ The force acting on an object is equal to the mass of the object multiplied by its acceleration. In other words, you can calculate how much force it takes to move objects with various masses at different speeds.
In mathematical form it is F = ma, where F is force, m is mass, and a is acceleration. The bold letters indicate that force and acceleration are vector quantities – they have both magnitude and direction.

3️⃣ For every action, there is an equal and opposite reaction.

They formed the basis for our understanding of mechanics and gravity and in Newton’s time were considered revolutionary.

The thing that could’t be explained by these laws is light.

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Is time travel possible?

For most people “time travel” means traveling faster than 1 second per second.

Real-life time travel occurs through time dilation, a property of Einstein’s special relativity.

The faster you travel, the slower you experience time.

⏱✈️⏱Scientists have shown that this theory is true. They used two clocks set to the exact same time. One clock stayed on Earth, while the other flew in an airplane going in the same direction Earth rotates. After the airplane flew around the world, scientists compared the two clocks. The clock on the fast-moving airplane was slightly behind the clock on the ground. So, the clock on the airplane was traveling slightly slower in time than 1 second per second.

In order to send a traveller years into the future, we would either have to take advantage of the intense gravitational acceleration caused by black holes or send the traveller rocketing into space at close to the speed of light (about 1 billion km/h).

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What is grandfather paradox?

🔁 This paradox is an example of a problem arising from the effect of time travel on causality, the idea that a cause must precede its effect.

🔁 It suggests that a cause is eliminated by its own effect, thus preventing its own cause and essentially becoming reverse causation.

🔁 The classic analogy for this, and the one that gives the paradox its name, is a time traveler journeying back in time and killing their own biological grandfather before they can sire children. This means the time traveler could never have come to exist and, as a consequence, can't travel back in time and thus can't kill their own grandfather. That means they then are born and can go back in time, hence the paradox.

ℹ️ In a recent study, researchers may have shown mathematically that the universe can self-correct to avoid inconsistencies. If this is true, then even if we could travel back in time, we would never be able to alter events to create a different future.

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What are 30 countries with the youngest populations?

ℹ️ Among 30 countries with the youngest populations, 28 are African and only 2 are Asian.

1️⃣ 🇳🇪 Niger has 56.9% of its population under 18 years old!

Other countries on the list are
2️⃣🇺🇬 Uganda - 55.0 % of population under 18
3️⃣🇷🇴 Chad - 54.6 %
4️⃣🇦🇴 Angola- 54.3 %
5️⃣🇲🇱 Mali - 54.1 %
6️⃣🇸🇴 Somalia - 53.6 %
7️⃣🇬🇲 Gambia - 52.8 %
8️⃣🇿🇲 Zambia - 52.6 %
9️⃣🇨🇩 Democratic Republic of the Congo - 52.6 %
🔟🇧🇫 Burkina Faso - 52.3 %
1️⃣1️⃣🇲🇿 Mozambique - 52.1 %
1️⃣2️⃣🇲🇼 Malawi - 52.0 %
1️⃣3️⃣🇹🇿 Tanzania - 51.6 %
1️⃣4️⃣🇦🇫 Afghanistan - 51.4 %
1️⃣5️⃣🇧🇮 Burundi - 50.9 %
1️⃣6️⃣🇳🇬 Nigeria - 50.4 %
1️⃣7️⃣🇸🇳 Senegal - 50.2 %
1️⃣8️⃣🇸🇹 Sao Tome and Principe - 49.3 %
1️⃣9️⃣🇨🇮 Cote d'Ivoire - 49.3 %
2️⃣0️⃣🇨🇲 Cameroon - 49.1 %
2️⃣1️⃣🇬🇳 Guinea - 49.1 %
2️⃣2️⃣🇸🇱 Sierra Leone - 49.1 %
2️⃣3️⃣🇹🇱 Timor-Leste - 49.1 %
2️⃣4️⃣🇪🇷 Eritrea - 49.0 %
2️⃣5️⃣🇨🇬 Republic of the Congo - 48.9 %
2️⃣6️⃣🇱🇷 Liberia - 48.9 %
2️⃣7️⃣🇸🇸 South Sudan - 48.8 %
2️⃣8️⃣🇧🇯 Benin - 48.8 %
2️⃣9️⃣🇪🇹 Ethiopia - 48.7 %
3️⃣0️⃣🇲🇬 Madagascar - 48.6 %

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What should you study if you want to study yourself?

If you want to study yourself and all the humanity, you should study anthropology, which is the study of how humans have been different biologically, physically, socially, and culturally over time and space.

It deals with both the biological features that make us human (physiology, genetic makeup, nutritional history and evolution), and social aspects (language, culture, politics, family and religion).

So, anthropologists are studying multiple aspects and processes of people’s lives, which define us as human beings.

A few common ❓ posed by anthropology are:

📌how are the societies different and how are they the same❓

📌how has the evolution shaped how we think❓

📌what is culture?❓

📌are there human universals❓

🚹🚺🚼 By taking the time to study peoples’ lives in detail, anthropologists explore what makes us uniquely human. In doing so, anthropologists aim to increase our understanding of ourselves and each other.

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What are subfields of Anthropology?

Anthropology is usually divided into several subfields.

✅ Archaeology is a major subfield of anthropology, well known thanks to major discoveries and pop culture. Archeology involves the study of human culture by recovering artifacts of past peoples.

✅ Cultural anthropology is the study of humanity’s different cultures. This subfield can overlap with archaeology and often involves information discovered from it. Unlike archaeology, cultural anthropology might study not only past but also present cultures, especially with how they differ from each other.

✅ Physical, or biological anthropology, focuses on how humans have physically and biologically changed over time. It also looks at how humans are different from other animals, especially chimpanzees and other primates. Anthropologists will often do this by analyzing bones of ancient humans or remains of animals that science considers to be relatives or ancestors of humans.

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What is literature?

📕 Literature is writing that uses artistic expression and form and is considered to have merit or be important.

📗 As an artistic term, literature refers to written works, such as novels, short stories, biographies, memories, essays, and poetry. However, songs, movies, TV shows, video games, and paintings are typically not considered to be literature because the final output is not text.

📘 At the same time, literature is usually thought to only include works of art. Informative works like newspapers, scientific journals, religious texts, press releases, and spreadsheets are generally not considered to be literature.

📙 Yet in scientific study, especially anthropology or history, the word literature is used more broadly to describe everything that a specific society or group has ever written. For example, a researcher may be studying Persian, Indian, Chinese, Russian or English literature.

✍️ The word literature comes from Latin litterātūra “writing.”

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What are the main genres in literature?

At the most basic level, there are 3️⃣ main genres for literature - poetry, prose and drama - each can be broken down even further, resulting in dozens of subgenres.

📚🖌 Poetry
tends to be written in verses, and typically employs a rhythmic and measured approach to composition. It has melodic tone and uses creative language that is often imaginative and symbolic in nature. It is typically divided into two main subgenres, narrative and lyric, and can be fiction and non-fiction.
The word “poetry” comes from the Greek word poiesis, which essentially means making or creating, which is translated into the “making of poetry”.

📚🖌 Prose
is essentially identified as written text that aligns with the flow of conversation in the form of sentence and paragraph, as opposed to verses and stanzas in poetry, and employs common grammatical structure and a natural flow of speech.
It can be broken down into a number of subgenres including both fiction and non-fiction works. Examples of prose can range from news, biographies and essays to novels, short stories, plays and fables.
The word “prose” derives from Latin prōsa ("straightforward") from the term prōsa ōrātio ("a straightforward speech- i.e. without the ornaments of verse").

📚🖌🎭 Drama
is defined as theatrical dialogue performed on stage and traditionally is comprised of five acts. It is generally broken down into four subgenres including comedy, melodrama, tragedy and farce. In many cases, dramas will actually overlap with poetry and prose, depending on the writing style of the author.
Dramatic pieces can be written in both poetic and prose style, and can be fiction or nonfiction.

ℹ️ Some resources will cite only 2️⃣ genres: fiction and non-fiction, though many classics will argue that fiction and non-fiction can, and do, both fall under poetry, drama or prose.

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What is the difference between astrology, astrophysics and cosmology?

🌌Astrology is the study of the connection between celestial activity phenomena and earthly events.
Unlike astronomy, astrology is not a science but a pseudoscience.

🌌Astrophysics is mostly defined as a sub-field or a branch of astronomy that applies the laws of physics to explain the birth, life, and death of objects in the universe (planets, stars, galaxies and nebulae). Interacting with objects in space is done by studying the amount of radiation they emit, and these emissions are examined by looking at properties like temperature, density, luminosity, and chemical composition.

🌌Cosmology studies the cosmos as one entity, rather than analyzing separately the stars, black holes and galaxies that fill it.
Its interdisciplinary nature explains its comparatively late start in the 1920s, shortly after Einstein developed the theory of general relativity.

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