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It takes time
but you can train your brain to do that.
So if you are suffering from nightmares
you may try to have lucid dreams.
In a lucid dream
you are able to control the dream.
But for young children
it often happens.
During REM sleep
 
a period of deep sleep
 
your brain is extremely active.
When you sleep
your brain cycles through rapid eye movement (REM) sleep and non-REM sleep.
Sometimes you can’t remember your dreams
but everyone dreams while sleeping.
Then
 
if the real germs get in the body later
 
the immune system can defeat them.
When a vaccine enters a body
the immune system learns how to fight the germs.
Then
you get a vaccine.
If germs get inside a body
the body’s immune system fights them.
When a disease spreads rapidly around the world
we call it a pandemic.
Many germs are harmless
but some cause diseases.
They are in the air
 
on food
 
and on everything you touch.
Some can disguise themselves as a leaf
 
a twig
 
or even a flower!
During summer
their fur turns brown.
It’s a way animals blend into their surroundings
so they are not seen by predators.
For example
birds’ beaks are shaped differently according to their food habits.
Organisms have adapted to get food
 
reproduce
 
or protect themselves.
Then
the food chain begins again.
When living things die
 
decomposers break down
 
or decompose
 
their tissues.
Producers produce their own food from air
 
water
 
and sunlight.
In some countries
people have skunks as pets.
Potbellied pigs have been trained to play the piano
 
dance
 
and even ride skateboards!
Because pigs are clever
they are easily trained.
Mini pigs
 
like potbellied pigs
 
are getting popular.
Crickets are considered good fortune in Native American cultures
too.
In Europe
having crickets in the kitchen is lucky.
In China
people believe crickets bring good luck.
In many countries
crickets are a symbol of good luck.
They might seem creepy to you
but some people keep insects as pets.
Sadly
Laika died during the flight.
In 1957
she was launched into space on a Soviet spacecraft.
But the first real space traveler was Laika
a Russian dog.
In 1947
the U.S. sent fruit flies into space.
At the beginning of the Space Age
scientists were clueless about what would happen to humans in space.
Their scent glands are removed when they are babies.
Don’t worry about it.
What about their smell?
Skunks are curious and playful.
Skunk owners claim they are great companions.
Could a skunk be a good pet?
In some countries, people have skunks as pets.
Potbellied pigs have been trained to play the piano, dance, and even ride skateboards!
Because pigs are clever, they are easily trained.
Pigs are smart and loyal to their owners.
Mini pigs, like potbellied pigs, are getting popular.
Would you have a pet pig?
Crickets are considered good fortune in Native American cultures, too.
In Europe, having crickets in the kitchen is lucky.
In China, people believe crickets bring good luck.
In many countries, crickets are a symbol of good luck.
Crickets are especially popular.
Bugs are cheap and easy to look after.
They might seem creepy to you, but some people keep insects as pets.
But some people prefer unusual pets.
Dogs and cats are the most popular ones.
People all over the world love pets.