يکشنبه 4 آذر 1403 - 20 جمادي الاول 1446 - 24 نوامبر 2024
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What is the difference between arithmetic and mathematics?
It is a useless exercise to establish difference between arithmetic and mathematics. Mathematics is abroad term that arithmetic as one of its branches. To move further in this topic it’s important to define ...
Study offers clues to how plants evolved to cope with cold
Researchers at UT have found new clues to how plants evolved to withstand wintry weather. The study suggests that many plants acquired characteristics that helped them thrive in colder climates — such as ...
Ants can Build Rafts to Escape Floods
Ants can build rafts to escape floods. These are not boats made of wood or leaves, but of fellow ants behaving in a collective structure for the greater good of the nest. During a heavy rain season, people living in flood plains have observed ...
Why do we have leap years?
We know that leap year occurs after every four years. Earth revolves around the sun in 365 days, five hours, 48 minutes and 46 seconds but we take one year of 365 days. There is still five hours left for the earth to complete its ...
Why do the days get shorter in winter?
There is less daylight in the winter than in the summer. You might notice that in July it could stay light out until 9:00 at night, but it gets dark much earlier in October. We know that earth is tilted at a particular angle and ...
How to Get Rid of Milk Stains
Milk doesn't look like a troublesome stain. After all, it's white and it seems like it rinses clean. The problem with milk stains comes after ...
Best Ways to Get Rid of Mayonnaise Stains
Mayonnaise is a controversial condiment. Some love it and and appreciate that it adds a wonderful flavor and richness to sandwiches and foods. Others, like a friend of mine, refer to it as white death. No matter which side you embrace, we all know it ...
How to remove tea stains
As a nation, we can’t deny that we’re partial to a cup of tea every now and then, but what happens if a nice fresh brew gets spilt? Stains happen! Tea stains can be a real nightmare, especially on ...
How to Remove Paint Stains from Clothes
There’s a fair chance your little one will return home from kindy or school with a paint stain at some point. The key to removing paint stains lies in ...
Some Effective Ways to Remove Coffee Stains from Clothing
Coffee can be one of the most troublesome stains to get out of clothing and carpets, but there are several strategies you can use to treat the stain. Here's a step-by-step approach to getting rid of a coffee stain. Depending on ...
How to remove chocolate stains
Chocolate is a favorite for young and old and everyone in between until it lands on clothes, furniture, fabric or even carpet. Removing chocolate stains is fairly easy provided you use the right techniques and just like any stains, the ...
How to Easily Remove Blood Stains from Different Materials
Blood stains can be especially difficult to remove because the hemoglobin in the blood acts as a binder when it ...
How to remove tomato sauce stains
Tomato stains are very common and surprisingly easy to remove despite their tricky reputation. Next time you see that orange ring start to spread, try some of these stain fighting tricks ...
Some Useful and Best ways Get Rid of Sweat Stains
Do you know how to get sweat stains out of clothes? It’s a must-have skill for busy parents who are constantly working up a sweat running after those little explorers. We’re here to make sure you’ve got all the ...
Shoe Odor- Get rid of it
Are you embarrassed to remove your shoes in front of others? Do you wish to throw away your favorite pair of shoes due to the foul smell it transmits? If the answer is yes, the good news is that you do ...
How to Remove Ink Stains from Clothes Easily?
Ink stains can be caused by several common culprits: broken pens, bleeding print, leaky toner cartridges, or tipped-over ink bottles. Regardless of the cause, there are many methods that people can ...
How to Remove Mud Stains
Every time it rains the most common results are mud stains. How can you stop your children jumping in the puddles or playing football on a muddy field? They enjoy it so much but, ...
How to Remove Water Stains
If you have hard water in the home, it means that your H2O contains large amounts of minerals, such as limestone, calcium, and magnesium. It’s perfectly safe to use but it can ...
How to Remove Ring-Around-the-Collar?
Ring-around-the-collar is an unsightly stain that happens inside the collars of dress shirts, or other shirts with stiff collars. It often builds up slowly until it is visible as a yellowish-brown stain and it is difficult to remove. It can cut the ...
Why does Snowfall occur?
Snow begins in the atmosphere as water condenses into a tiny droplet. As more and more water vapor condenses onto its surface, the droplet grows. Cold air then freezes this water into an ice crystal. Each ice crystal has a unique shape that depends on ...
Why Do Stars Twinkle?
At night, we see millions of twinkling stars in the sky. In all directions light is radiated by these stars. Even if they look very small in size however, actually they are very big in size. Most of the stars are ...
What Causes Monsoons to Occur?
A monsoon is a seasonal change in the direction of the prevailing wind. This wind shift typically brings about a marked change in local weather. Monsoons are often associated with rainy seasons in the ...
What Colors Mean: Black
Black is the color of coal, ebony, and of outer space. It the darkest color, the result of the absence of or complete absorption of ...
What Colors Mean: White
Fresh milk and snow both are the color white. White contains all the wavelengths ofvisible light without ...
What Colors Mean: Yellow
Yellow is the color of gold, butter, or ripe lemons. In the spectrum of visible light, and in the traditional color wheel used by painters, yellow is ...
What Colors Mean: Purple, Violet
Purple is a range of hues of color occurring between red and blue. In additive light combinations it occurs by mixing the primary colors red and blue in varying proportions. It is a secondary color because ...
What Colors Mean: Blue
Blue is the colour of the clear sky and the deep sea. On the optical spectrum, blue is located between violet and ...
Victory and Failure Situation
Youre never as good as everyone tells you when you win, and youre never as bad as they ...
What Colors Mean: Green
Green is the color of emeralds, jade, and growing grass. In the continuum of colors ofvisible light it is located between yellow and blue. Green is the ...
What Colors Mean: Red
Red is the color of blood, a ruby, and strawberries. Next to orange at the end of thevisible spectrum of light, red is ...
Why Can’t We See Stars During The Day?
After the sunset the stars become visible in the sky. When the darkness of sky increases, the number of stars and their brightness also increases. As the sun come up to the sky, the number of ...
PLANET EARTH: POLLUTION and SUSTAINABLE DEVELOPMENT
Pollution is waste that we put into the environment. It can harm plants and animals, including humans. Pollution comes from ...
PLANET EARTH: HABITATS
A habitat is a place where plants and animals live, and provides them with food and shelter. It can be very small, such as a ...
PLANET EARTH: RAIN
The moisture gathered in clouds eventually falls to the ground as liquid rain or drizzle, or as ...
Interesting Foods of the World
This popular meal is made of minced lamb or beef; bread, rice or potatoes, onions, and ...
PLANET EARTH: CLOUDS
Air always contains some water vapour from oceans, lakes, and the ground. Clouds form when the air cools below a ...
PLANET EARTH: WIND
Wind is the movement of the atmosphere. The atmosphere moves because the Sun heats the ...
Five Kingdoms of Life
Every living creature on Earth belongs to a kingdom. Scientists debate how many kingdoms there are, but most ...
PLANET EARTH: WEATHER
The weather is the day-to-day condition of the atmosphere at a particular place and time – whether the air is ...
PLANET EARTH: CLIMAT
Every part of Earth has its own climate – the typical pattern of weather over a long period of ...
PLANET EARTH: GROUNDWATER, LAKES, ATMOSPHERE
Groundwater is water under the Earth’s surface. Most groundwater is found in porous rocks, which have tiny holes in ...
PLANET EARTH: OCEAN FLOOR
Just a century ago, the ocean floor was largely unknown. Now we know that the deep oceans have features such as ...
PLANET EARTH: OCEANS
About 71 per cent of our planet’s surface is covered by oceans and seas. In order of size, the five great oceans are the ...
PLANET EARTH: COASTS
Coasts, which form the boundary between land and ocean, receive a constant battering from the wind and ...
PLANET EARTH: ICE
About one-tenth of Earth’s dry land and one-eighth of its oceans are covered with ice. This ice is made of ...
Geography Hall of Fame
This hall of fame speaks about highests, smallests, deepests, largests and lowestsand ....
PLANET EARTH: SEDIMENTS
The rocky material that is transported and DEPOSITED by rivers, seas, glaciers, and the wind is ...
PLANET EARTH: SOIL
Much of the solid bedrock of the Earth’s crust is covered in soil. This loose, soft material is a ...
PLANET EARTH: EROSION
The process that breaks up and carries away the rocks and soils that make up the Earth’s surface is ...
GEOLOGICAL TIME
Geologists (scientists who study rocks) divide the time since the Earth was formed until today into ...
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