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11/07/26
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توضیحات اصلی
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پیامهای اخیر
states of matter that exist under extreme conditions
How many phase changes of matter are there?
📌
A phase change
or
phase transition is a change between solid, liquid, gaseous, and sometimes plasma
states of matter
.
📌
The main factors that cause phase changes are changes in temperature and pressure.
At the phase transition
the two states of matter have identical free energies and are equally likely to exist.
❗️
There are
8️⃣
phase changes between
Where do the most genetically diverse people on Earth live?
🌍
The most genetically diverse people on Earth live in Africa.
Geneticists have discovered more than 3 mln previously undescribed genetic variants among
Africans
.
That diversity has fit well with the fossil evidence that the
human species
originated in Africa. It is known that when a new species, be it plant or animal, arises and spreads
How does the brain store memories?
🧠
In
the brain
, the hippocampus region, crucial for learning and
memory
,
records each event in three different forms or “copies”
.
These ‘”copies” are disseminated among different groups of
neurons
that arise at various stages during embryonic development.
1️⃣
The early-born neurons ensure the longevity of a memory creating a copy that, although initially weak,
Who left Paleozoic “dumbbells”?
All over the world, scientists find
dumbbell-shaped fossils in rock outcrops
that
are called Bifungites
and a
re not fossilized animals but burrows left in an extinct creature’s wake
.
⬆️
Most are found in rocks from the
Paleozoic era
more than 300 million years ago.
🪱
Not long ago,
Brazilian paleontologists
, exploring the bed of the Sambito River in northeastern B
When and why was the Sahara green?
✅
Records from ocean sediment show that
the Green Sahara happens repeatedly
in Earth's history.
✅
Sometime
between 11,000 and 5,000 years ago
, after the last
ice age
ended, about
9 mln square kilometers (3.5 mln square miles) of the modern Sahara Desert was a green place
with lakes, where animals like elephants, hippos and antelopes feasted on thriving grasses a
Could the Sahara be green again and will Africa finally need its “Great Green Wall”?
🟢
Africa’s “Great Green Wall”
initiative was launched to hold back the Sahara from expanding southward.
🟢
This year, after an unusual influx of rain, scientists have compared satellite imagery on September 12, 2024 (
⬆️
upper image), versus the same day in 2023 (
⬆️
lower image), and have seen that the southern Sa
What is a role of Saharan dust on hurricanes?
🌪
🌧
Hurricanes, including tropical cyclone rainfall (TCR), are among the most destructive weather phenomena on Earth.
🌡
💧
Traditionally, sea surface temperature or humidity in the atmosphere were considered as the main factor controlling hurricane precipitation.
🏜
❗️
Now, scientists believe that
Sahara dust plays a leading role on hurricane formation
o
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