Homemade invisible ink using lemon juice

 What we need

1.  Cotton bud

2.  Lamp

3.  Plain white paper

4.  Bowl having lemon juice 

Experiment 

1.  Take the bowl having lemon juice. 

2.  Dip the cotton bud in the mixture and use it to write something on the white paper.

3. Allow the paper to dry.

4.  Now no one can read what we have written on the paper  !!!!

What happened 

1.  Secret message can be revealed when we hold the paper, close to light bulb.

2. Lemon juice contains carbon compounds which are colourless at room temperature.

3.  The heat from the light bulb breaks down these compounds and releases the carbon.

4.  Carbon oxidises when it comes into contact with the air and turns brown. 

5.  Thus our invisible message becomes visible to every one  !!!!! 

Red sand that we can eat !!!

 We all know about Strait of Hormuz which is now blocked by Iran thereby making the oil and gas supply to the world difficult.

But here I am not talking about strait of Hormuz  !!!

I am talking about Hormuz island which has one of the most unique beaches in the world which is known as " blood beach ".

The sand on Hormuz beach takes on a deep red shade due to high iron oxide content.

This mineral rich soil gives the coast line its blood red appearance  !!!!

Locals refer to this sand as " gelak  ".

Its pigmentation is so intense that it can stain the skin for days  !!!

Some sand grains even react to magnets.

This sand is a critical ingredient of Iranian cuisine. 

No.....   No........

Residents don't eat this sand in its powdary form  !!!

Rather they use it as a spice.........

 

This sand is also used in dyeing fabrics and colouring pottery.

What are astronomical phenomenon Pulsar ??

 This question was asked on Koun Banega Karodpati program.

Question 

What are astronomical phenomenon Pulsar  ??

1.  Neutron Star

2.  Black hole

3.  Supernovae 

4.  Comet 

Answer 

Pulsers are rapidly rotating neutron stars.

They emit electromagnetic radiation in beams pointing away from their rotational axis.

These beams are visible only when they sweep past our line of slight, much like a lighthouse beam.

That's why they are called pulsars    !!!

Bheja Fry question

I came across this Bheja Fry question on internet.

Question 

If    1  +   3    =   4

       2  +  4   = 10

        3  +  5  =  18

Then   4  +  6   = ???

Answer 

       1  +  3  =  4  (  given  )

       2  + 4   = 6 but 10  (  given  )

       3  +  5  =  8  but 18  (  given  )

       

If we see the differences between the actual and given answers,  we can say that each time the difference is getting increased by  6 , 8........

If we follow the  same pattern, the next difference should be   10.

==>>   4  +  6  =  28  actually it is 10 

So 1 + 3 =  4

      2 + 4  =  10

       3 + 5  =  18

        4  +  6  =   28

Which ocean has maximum number of islands ??

 Pacific ocean has maximum number of islands.

Pacific ocean is the largest ocean on earth.  It covers 1/3 rd of the planet 's surface  !!!!

Pacific ocean lies along the Ring of Fire which is known for intense volcanic activity and frequent earthquakes. Continuous volcanic eruptions create new islands.

Major island groups in Pacific ocean 

1.     Polynesia 

              Consists of Hawaii, Samoa, Tonga and Tahiti.

2.  Micronesia 

            Consists of Martial islands, Palau and Kiribati 

3.  Melanesia 

           Consists of Papua New Guinea, Solomon islands, Fiji and Vanautu.