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2022-02-06 07:30:00 What is the most accurate “flat map” of Earth?

Various flat maps have been drawn over the centuries, but they all have the same issue: It is impossible to portray the 3D Earth on a 2D map without compromise.

For instance, many 2D maps, which we used to see in textbooks and on classroom walls, depict Greenland as about the same size as Africa, when in fact Africa is 14 times larger, and contain other distortions, particularly regarding the Pacific Ocean, which looks vaster than it is in reality.

In 2021, astrophysicists produced what is believed to be the most accurate flat map of Earth ever.

It consists of two "pancake maps" that can be viewed side by side or back to back.

Unlike other flat maps, the new circular map doesn't downsize or supersize the area of certain oceans or landmasses.

This way of presenting the Earth is fundamentally different to nearly every other flat map, and it remains to be seen if it will be widely adopted for general use.

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2022-02-05 12:30:00 What are top 10 countries with the most trees?

There are more than three trillion trees in the world and here are top 10 countries where most of them grow.

1. Russia isn’t only the biggest country by size but it also has the largest number of trees covering approximately 8,249,300 sq. km which is almost equal to 45% of the country’s total land area.
2. Canada: 4,916,438 sq. km of trees, covering 30% of the country’s total land area.
3. Brazil: 4,776,980 sq. km of trees and 56% of the country.
4. USA: 3,100,950 sq. km of forests and 30% of the US total land area.
5. China: 2,083,210 sq. km of forest cover.
6. Australia:1,470,832 sq. km of forest land and 19% of the country.
7. Democratic Republic Of Congo: 1,172,704 sq. km of trees or 52% of its territory.
8. Argentina: 945,336 sq. km which stands for almost 32% of the country.
9. Indonesia: 884,950 sq. km of forests, 46% of the total land area.
10. India: 802,088 sq. km of trees.

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2022-02-05 07:30:00 How many tree species inhabit the Earth?

Based on the latest global ground-sourced data, scientists estimate that there are ∼73,000 tree species globally, among which ∼9,000 tree species are yet to be discovered.

Roughly 40% of undiscovered tree species are in South America.

Moreover, almost one-third of all tree species to be discovered may be rare, with very low populations and limited spatial distribution (likely in remote tropical lowlands and mountains).

These findings highlight the vulnerability of global forest biodiversity to anthropogenic changes in land use and climate, which disproportionately threaten rare species and thus, global tree richness.

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2022-02-04 16:17:00 What are Trojan asteroids and how many of them are sharing orbit with the Earth?

Trojan asteroids are small bodies orbiting around the L4 or L5 Lagrangian points of a Sun-planet system. Due to their peculiar orbits, they provide key constraints to the Solar System evolution models.

Currently there are more than 7,000 trojans catalogued in the Solar System. Most of them share the orbit of Jupiter.

In other planetary orbits two Uranus trojans, nine Mars trojans, and 28 Neptune trojans have been found to date.

Regarding the orbit of our planet, for the moment astronomers know about two Earth trojans. The first one is 2010 TK7, discovered in 2010, and the second is 2020 XL5, detected in 2020 but whose trojan status was confirmed by scientists just recently.

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2022-02-04 13:19:33 Join our group Bybit Activities 2022(EN) to see more details to have the chance to get up to $500 bonus!
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2022-02-04 06:30:00 What countries have the most islands?

Three Scandinavian states are the world‘a leaders in terms of islands being part of their national territory.

Sweden is home to 221,800 mostly uninhabited islands. This number includes islands as small as 270 square feet (25 square meters), which is about the size of a one-car garage.

Finland, the runner-up, has an estimated 188,000 islands, while Norway, which rounds out the top three, is a long way behind, with around 55,000.
In general, this fact is explained by geological history and climate of these Nordic countries.

At the same time, specialists point out that these island statistics can be a subject for debate depending on the definition of an island.

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2022-02-01 18:00:37 When did humanity realize the risks of climate change?

More than 3,000 years ago, in Ancient Greece people began to debate whether draining swamps or cutting down forests might bring more or less rainfall to the region, but these documented climate change discussions had a local focus.

In 1896, building up on works of other researchers, a Swedish scientist Svante Arrhenius (1859-1927) became the first person to surmise that humanity could change the climate on a global scale.

In 1957, an American researcher Roger Revelle published a study, revealing that the ocean will not absorb all of the carbon dioxide released in humanity's industrial fuel emissions and that carbon dioxide levels in the atmosphere could rise significantly.

Since then more studies began to appear highlighting climate change as a potential threat to species and ecosystems around the world. However, it’s only at the end of the 1980s when the humanity started to take real measures facing the global challenge.

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2022-01-30 17:27:04 What are four major concepts in science?

Scientists distinguish between facts, hypotheses, laws and theories.

Facts are simple, one-off observations that have been found to be true.

Laws are generalized observations about a relationship between two or more things in the natural world based on a variety of facts and empirical evidence, often framed as a mathematical statement. They simply describe and don’t explain phenomena.

A hypothesis is a potential explanation of a narrow phenomenon.

A scientific theory is an in-depth explanation that applies to a wide range of phenomena.

Unlike the legislation, a scientific law is much more flexible. It can have exceptions, be proven wrong or evolve over time.

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2022-01-29 16:32:19 How much horsepower can one horse produce?

Based on the term, one may assume that a horse can produce around 1 horsepower.

Linguistically, it makes sense. In reality, it's way off the mark.

The maximum output of a horse is actually much closer to 15 horsepower.

In fact, a more befitting name for the unit might be "humanpower," as the average healthy person can produce just over 1 horsepower.

Where did the term come from?
It was coined in the late 1700s by James Watt, a Scottish engineer remembered for his steam engines.

To highlight the superiority of his contraptions he decided to compare steam engines to horses and invented a unit of measurement.

Based on his observations Watt estimated that working horses were capable of pushing about 33,000 pounds 1 foot per minute (14,968.55 kilograms 1 meter per minute).

That’s how the "horsepower" unit was born.

Watt’s machines were more powerful than horses, and very few people questioned the veracity of his calculations.

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2022-01-29 07:00:21 Who invented Bluetooth and how does it work?

Bluetooth is a method of short-range wireless communication between electronic devices that harnesses the power of radio waves.

But if the radio spectrum stretches from 30 Hz to 300 GHz (the lower the frequency, the longer the range), Bluetooth operates at 2.4 GHz which gives it the right balance between range and data quality.

It was conceived by a Dutch engineer Dr Jaap Haartsen at the Swedish mobile giant Ericsson in the 1990s.

In 1998 the Bluetooth Special Interest Group (SIG) was formed to develop and promote the technology.

The group released Bluetooth 1.0 in 1999 and a year later it began to be used in mobile phones and desktop PCs, making its way into laptops and printers in 2001.

In the mid-2000s, the Bluetooth headset – which allowed people to communicate hands free – became a common sight.

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