It's AumSum Time
Hi guys.
Can you guess the title of my next video?
Diamonds.
Oh.
Where did they go?
Hurry up.
Write your guess in the comments section below.
Oh.
A grasshopper hears through its belly?
It has hearing organs called tympanums and air-filled sacs which together help the grasshopper to hear.
This mechanism is so accurate that just by hearing a female's call for mating.
Males can pinpoint her exact location.
Also, from a grasshopper's pitch, other grasshoppers can determine its size.
If it appears big, males don't enter its territory and avoid fights, while females call back for mating.
Topic: Electric charge.
How does a plastic comb attract paper?
What?
You don't believe me?
Okay.
Let us try.
Take a plastic comb and bring it close to some pieces of paper.
Hey wait.
Don't laugh.
We need to do something first.
Rub the comb on your dry hair and then bring the comb close to the pieces of paper.
See, I was correct.
The pieces of paper got attracted to the plastic comb.
Do you think it is magic?
No, the reason behind this is electric charge.
Electric charge is the quantity of electricity held in an object.
There are 2 types of electric charges, positive and negative.
However, there are some objects where the positive and negative charges are equal to one another.
In such cases, we say that the object is electrically neutral.
So, was the plastic comb initially electrically neutral or electrically charged?
Initially, the plastic comb was electrically neutral.
That means it had equal number of positive and negative charges.
Hence, it did not have the ability to exert a force and attract the pieces of paper.
So, after rubbing the plastic comb on our dry hair, why was it able to attract the pieces of paper?
I will tell you why.
When we rubbed the plastic comb on our dry hair, it gained an electric charge.
Once it got electrically charged, it got the ability to exert a force on the pieces of paper and attract them.
This charge is called as static electricity.
However, do you think, like a plastic comb, a metallic comb will also attract the pieces of paper?
No, you are wrong.
A metallic comb will not attract the pieces of paper like the plastic comb.
Wondering why is that so?
It is because plastic is not a good conductor of electricity.
It does not allow the electric charges to flow through it onto the earth.
As a result,
The charges build in the plastic comb, making it electrically charged.
Enabling it to attract the pieces of paper.
However, metal is a good conductor of electricity.
It does not let the charges build in it.
It allows the electric charges to flow through it onto the earth.
Thus not allowing the metallic comb to get electrically charged.
As a result, the metallic comb does not attract the pieces of paper.
Topic: Forced vibrations.
Why does a guitar have a hollow box?
To keep clothes while traveling.
Not at all.
Wait, I'll explain.
Whenever we strike an object, it vibrates.
Sometimes, these vibrations influence other objects to vibrate.
The vibrations which take place under the influence of an external periodic force are called forced vibrations.
So, whenever I see delicious food, my stomach starts to vibrate.
Is this a type of forced vibration?
Please concentrate.
A guitar has a hollow box which holds quite a huge volume of air.
Now, when we strike its string, it starts to vibrate.
These vibrations influence the air in the hollow box, producing forced vibrations in them.
Now we know that vibrations in air produce sound.
Hence, as a huge volume of air is vibrating, the sound produced is louder.
Why is yawning contagious?
Because everybody wants to sleep.
No.
There are a couple of theories which explain why yawning is contagious.
One of them suggests that it is a sign of empathy.
Empathy is the ability to understand and share others feelings.
For example, when people around us are happy and smiling, they make a positive impact on us.
Hence, we also feel good and begin to smile.
Moreover, the closer we are to someone such as our parents or friends.
The more likely we are to catch their yawn.
Dude, that's awesome.
Another theory suggests that,
Mirror neurons present in our brain make us copy or mimic the actions performed by someone else.
Hence, when we see people around us yawn.
Our mirror neurons get activated, thus making us mimic their yawn.
We may have evolved such characteristic to promote social bonding.
Why do we bite our nails?
To save our expenses on manicure.
No.
Nail biting or onychophagia is a bad habit and there is no specific reason why people do it.
I'll find the reason in only 2 seconds.
Don't bother.
A habit forms due to three things, a trigger, action and reward.
So, in case of nail biting, a research suggests that a broken nail which is hurting can be a trigger.
Biting and removing it is the action.
When the broken nail is taken off, the pain is reduced and we feel better.
This is our reward.
Now, if we again encounter similar triggers like a broken nail.
We repeat the same action to get the reward.
Which gradually causes onychophagia, that is, we get a habit of nail biting.