I think it's a reference to a video game - "Dark Souls" (If this is a nerd test, I may have just failed it!)

Sounds great to me! You could also say 'each morning' but I think 'every' sounds better.

The Birthday Present

The time has flown. I started to read<font style="background-color: yellow;"> a</font> <strike>the</strike> half- read book named "The Russian Spy" written by Sir Arthur Conan Doyle. In spite of my ill health, I wanted to keep my eyes open<strike>ed</strike> only because of the seductive writing style which maniced me. <font style="background-color: rgb(181, 214, 165);"> (The standard way of saying this would be to say 'drove me crazy' but you could say 'made me manic'.  If you're playing with words intentionally, you'd want to spell it "manic-ed" me or "manic'ed" me, as otherwise it doesn't read correctly.)</font>

My two little sons were doing something secret beckoning to each other. Pretending that I was reading the book, I floated my ears to hear the secret. Literally I was correct. They were in a secret mission. I just turned to them and both distracted thinking I came to know about their plan.

After couple of minutes, they were counting money which my parents presented them as a new year gift. Since they were talking in a low voice, I couldn't hear properly what they were whispering to each other.

Suddenly I remembered my elder son asked about my up coming birthday. The time has flown. Now I'm a<strike>n enough </strike>matured<font style="background-color: rgb(255, 255, 0);">-enough</font> lady. I neither care about my birthdays nor<font style="background-color: rgb(255, 255, 0);"> do</font> I ever arrange<strike>d</strike> <font style="background-color: rgb(255, 255, 0);">in</font>dignfied celebrations.<strike>Sometimes</strike> <font style="background-color: rgb(255, 255, 0);">It seems </font><font style="background-color: rgb(181, 214, 165);">(I'm guessing--it's a little unclear, but Sometimes surely doesn't make sense) </font>this secret mission is about my birthday. Since I was poking my nose <strike><font style="background-color: rgb(255, 255, 0);">o</font></strike>n<font style="background-color: rgb(255, 255, 0);"> the</font> kids's business, I couldn't read the book properly. So, again I was on my way to read. But the memory of my last birthday emerged through the pages of book and beckoned me to walk arm in arm to the passed year.

Some close people also forgot to wish me<font style="background-color: rgb(255, 255, 0);"> happy birthday</font> on my last birthday. It's not because they didn"t care <font style="background-color: rgb(255, 255, 0);">about </font>me. I'm <strike>enough</strike> mature<strike>d</strike><font style="background-color: rgb(255, 255, 0);"> enough</font> to understand about their busy life styles. But my little ones were busy running here and there and time to time they locked their room.

Suddenly,
" Happy birthday to you...."

They were singing for me holding a little box and a bunch of flowers picked from my garden. After presenting the present, those gleaming eyes were excited to see what I would say. I slowly opened the wrap. My eyes filled with tears seeing the things they have gifted me.

There was a hand made birthday card and old jewellery box. I was curious to open it and see what was in side. I was presented two bangles I used to wear 15 years back, one ear ring ( not a pair) and coins of twenty rupees.

"Do you like it Amma ( mother) ?"

My answer was a tight hug. "This is the best birthday gift I have ever received." I whispered with an over flowing love. In my entire life I never recevied such kind of gift which filled with "love and care." Till my last breath this precious gift will remain with me.

All corrections are highly welcomed.

Another beautiful piece Meera!  You really seem to have great kids!

The Result

Finally the result has come. My son entered to the home inwith a sad mood and his face was just like the cloudy sky. I hide my moved mind (this is beautifully poetic, and I understand you, but if you wanted to be clearer you would probably say "I tried to hide my worried thoughts") and welcomed him as usual. He looked at me leeringly with a berry face.  (Again, I love the image of a round, 'berry face' but this is not standard English if you're trying to convey something specific.  Also, I don't think 'leeringly' is a word.  You could say he leered at you, but there's often a sexual connotation to leering that doesn't fit here.  I would say He looked at me 'mischeviously' maybe?) But I saw brightness in his eyes which he tried to hide from me. I floated my eyes to catch his eyes. A hidden secret was popping up in his eyes and hardly he was controlling him without letting his smile to come out. But his nose disclosed everything as he puffed up the nose when he was going to say lies.

"Ah! Caught."

A big smile emerged and he wrapped me tightly telling, "your son is the best student of the class." As usual tears were rolling down and I kissed him, whispering "God bless you."

"Apart from you and your love, nothing else I want amma ( mother)."He murmured with a cute voice.

Honestly, this is one of the most beautiful things I've read on italki (or anywhere else) in a while.  You have a beautiful use of the language.  I added a couple of thoughts, but I honestly wouldn't change much!

Dogs and us Share More Than a Friendship: We Have the Same Intestinal Flora

Recently, scientists attempted to prove there is a link between obesity and our intestinal flora. Because pigs and mice share a bunch of physiological aspects with us, they are the most used animals in health studies.

But this time, scientists wanted to include dogs. These dogs followed a healthy diet and then an unhealthy diet, and then, scientists analyzed the bacterium of dogs' droppings. They were surprised by two things: dogs had the same bacteria as human beings and their intestinal flora also reacted to unhealthy food as human beings. (I don't understand this--do you mean their intestinal flora also reacted to unhealthy food in the same ways as humans' flora reacted to unhealthy food?  You should probably clarify, because it isn't clear to me.)

This study proves that the link between dogs and humans is stronger than we thought. They don't know why we share the same intestinal flora with dogs but the main theory is that we have eaten the same food for more than 10.000 years.

This is really good, and super interesting!  A couple of suggested edits, and one comment as I wasn't sure quite what you were trying to say there in order to correct it directly.  Sorry!