HOW TO COPY THE SHAPE OF A KEY?

Lets see how we can copy the shape of a key!!

*TO BE PERFORMED ONLY ON A SUNNY DAY...

Materials Required

1) 2 or 3 pieces of black construction paper

2) Tape

3) Some old keys

4) Scissors

Instructions

Cut the construction paper into pieces of 3 inches by 3 inches.

Find a place outside with strong sunlight where nothing would disturb your experiment.

Put the papers outside tape the corners of the paper or put a heavy object on the paper so the wind cannot move it.

Place a key in the center.

After 4 hours remove the keys. You would see impression of the keys

HOW TO MAKE A FOOTPRINT CASTE?

Have you ever tried to make a plaster caste of a foot print? Lets try!!

Materials Required:
1) 1 Empty 2 lb coffee cans with lids (3-lb cans can also be used)
2) 1-lb plaster of Paris
3) Water
4) A wooden mixing Stick
5) 1 cup measurer
6) A screwdriver
7) 1 magnifying glass

Instruction

Make foot prints on dampened soil outdoor with a clearly patterned shoe sole, and choose the clearest and deepest footprint for the cast.

Put three cups of Plaster of Paris into a coffee can and add two cups of water to the can and mix well with the wooden stick. The plaster should be as thick as melted ice cream, let it stay for a few minutes.

Now pour the plaster of Paris gently into the footprint, let it flow over the edges.

With a twig write the date, location on the wet plaster.

Wait for 20 to 30 minutes, until the plaster hardens. Once it hardens gently dig around its edges with a screwdriver and take it off.

Your footprint caste is ready!! 

SECRET MESSAGE ON AN EGG!!!

Have you ever wondered that a secret message can be codded on an egg?! Let us find out!

Materials Required:
1) 1 Hard boiled Egg
2) 1 White wax crayon
3) 1 or 2 cups of distilled vinegar
4) Water
5) 1 big glass
6) A soft scrub brush

Instructions

Write a message on the egg with a white crayon. And pass it out to the person you want to give the secret message to. 

To Read The Message Do The Following:

1) Put some vinegar in the glass and put the egg with message written on it into the vinegar.

2) Tiny bubbles start to form on the egg. When the bubbling stops in about 1 to 2 hours, pour of the vinegar and replace it with fresh vinegar. After 4 hours pour off the fresh Vinegar. Wash the eggs under fresh water. gently scrub the crayon wax off the shell with the cleanser and brush. You can now read the message easily.

What Is Happening??

An acid is used to eat away some part of the surface of a material. Other parts are covered with a substance that the acid is unable to bite through, hence it acts like a protector and protects the surface of the material it is covering. This process is called Etching

DECODER GRID

Spies need to transfer messages. Well how do they do this? They do this by sending messages in codes, so if the message falls in the wrong hands it is not understood. One of these code is the decoder grid. Lets make one!!!

To Make The Decoder Grid:

Materials Required:
Scissors
Pen Or Pencil
2 Sheets Of Paper
Scale

Instructions

Make a 12cm X 12cm square on the sheet of the paper. Make 6 rows and columns so that it has 36 boxes. [2cm X 2cm]

Now cut out the second, sixth,eleventh, fourteenth, sixteenth, nineteenth, twenty-eighth, Thirtieth and thirty-third boxes. At the top write " DECODER GRID"

Cut the square out (make sure that the decoder grid is still written on the top)

Your Decoder Grid is ready!!!

Using The Decoder Grid

Place the  Decoder Grid over a piece of blank paper. Make sure that the words "DECODER GRID"

is on the top. Trace around the top left corner of the grid to help your contacts position their own DECODER GRID correctly.

Write one letter of your message in each of the open squares. When the 9 spaces are filled turn the grid to the right. Now the "Decoder Grid" is toward the right. Remember to place the edge facing the mark (the mark you made by the top left corner) is positioned correctly.

Continue to right turn it again when you need to.

Once you have filled the message will all the blanks with dummy letters.

Your code is ready to be transferred!

HOW TO ELECTROPLATE AN IRON NAIL WITH COPPER!!!

Have you ever noticed the shiny handles of a bicycle? Do you know why is it shiny? This is because a material has been coated with chromium. If you scratch this surface you would find a very dull material inside! Lets see how to electroplate an iron nail with copper!!

Materials Required:
1 Copper Plate
1 Iron Nail
Copper Sulphate
1 Beaker
1 Battery
250 ml Distilled Water
Dilute Sulphuric acid (to speed up the process; optional)
Sandpaper
Some Wires

Instructions

In a glass beaker put 250 ml of distilled water.

Dissolve 2 teaspoonful of copper sulphate. Then add a few drops of dilute sulphuric acid.

Clean the iron nail and copper sulphate with sand paper, wash with water and then leave for drying.

Connect the nail to the negative terminal of the battery through a wire, and the copper plate with the positive terminal, dip put them (they are called "electrodes") in the copper sulphate solution and leave them for 15 minutes.

Observation: The nail is coated with copper!

What Is Happening??

When electricity is passed through the solution, copper sulphate breaks up into copper and sulphate. The copper is deposited on the electrode connected to the negative terminal (iron nail). But what about the loss of copper in the solution? Well, the copper plates replace the amount of loss copper in the solution. Hence, we can say that we are using the copper plate to electroplate the iron nail! 

UNDERSTANDING TASTE BUDS!

Have you wondered how can you taste your food/beverage etc? Well lets try this simple experiment!

Materials Required:
Punch Hole machine
Sheet Of Paper
Cotton Ball
Food Coloring
Mirror

Instructions

 Use A punch hole machine to make a small hole in the sheet of paper.

Take a cotton ball, dip in in the food coloring and wipe the color on your entire tongue

Put the colored part of your tongue through the hole, in the paper and look in the mirror. Count the round bumps in the paper hole.

If you have 25 or more than 25 bumps, it means your taste is very sensitive ie; your sense of taste is awesome!!! If you have below this number you are a ordinary taster.

Information On The Tongue:

• A tongue has 4 basic types of taste buds: bitter, sour, salty and sweet.
• The more taste buds you have the better your sense of taste is
• Taste buds are replaced every 1 to 2 weeks.

HOW TO MAKE CANDLES FROM WAX CRAYONS!!!!

Let's make candles from wax crayons!

Materials

Wax crayons

Pan

String

Spoon

Skewers

Paper Cup

Instructions

Put the wax crayons into the pan and melt them over low heat and stir the crayons around gently.

While the wax is melting, make a small hole in the paper cup with the help of a skewer and put the string through the hole and then tie a knot underneath, the string should be long enough so that you can hang your candle to dry.

Now pour the wax into the paper cup, then hang it in a dry place for it to dry.

After 4 to 5 hours take the candle out and cut the thread (make sure that there is at least 1 cm of thread remaining at the top for the wick)

You are now ready to use your homemade candle!!!