Posts tagged: Unplugged Project

Fireworks in a Dish

By , March 6, 2011 4:35 pm

If you have milk, food coloring and dish washing soap on hand…

you can have impressive rainy-day science fun!

Pour some milk into a plate:

Wait a minute for any motion in the milk to settle down, then add four drops of different colors of food coloring.  Place the drops next to each other near the center of the plate.

 

Wait a minute or so until the colors get a bit blotchy-looking:

 

Take a clean cotton swab and gently place it on the colors.  What do you think will happen?

(SPOILER ALERT:  Absolutely nothing.)

Now put a drop of dish soap onto the other, clean and dry end of your swab.

What will happen when you put the soapy swab gently onto the colors?  Look!

It even continues impressively swirling and churning after you have lifted the swab out of the milk!

Try putting your swab in different areas of the plate to see what new patterns form.

NOTE:  It is very important not to stir, just hold your swab still in the milk.

Make sure you have plenty of milk and food coloring on hand for this because your kids won’t want to do it just one time.  This kept my 5 year-old entertained for at least an hour!

Many thanks to Steve Spangler’s Science Experiments for this really fun idea! Steve Spangler has a good explanation of the science behind this colorful display. You can read it here.

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This is my contribution to this month’s Unplugged Project theme of soap.  Can you come up with a soap-themed project?  If so, please join in and add a link or comment to the original project post.  You can read more about the Unplugged Project here!

“Soap” – March Monthly Unplugged Project

By , March 1, 2011 10:18 am

The theme for March’s Unplugged Project will be (…drumroll please…):

Soap

As long as there is some arguable connection to soap, you are good to go!  Be creative, have fun, please join us.

Please share your project either via a link to your blog post, or, if you are blogless, describe your project in a blog comment.  The more projects we have to share, the more fun it is.

For more information on what The Unplugged Project is, I invite you to read-up on it here.

 

 

“Page” – February’s Monthly Unplugged Project

By , February 1, 2011 11:01 am

Wow, it is February already and time for a new Monthly Unplugged Project theme!  The theme for February will be:

Page

For more information on how to join in with the Unplugged Project, you can read up on it here.  You have until March 1st to post a link to your project (or a description of your project in the comments for non-bloggers).

I have also recently added a list of all past Unplugged Project themes with links to each post.  Check it out if you want a little inspiration in your life.

I hope many of you will join in this month!

(Please only link to “page”-related projects. In an effort to keep this a useful resource, I will have to remove unrelated links, no matter how nice your website.)

Invisible Ink Messages (“Messages” Unplugged Project)

By , January 23, 2011 4:00 pm

All spies love invisible ink.  In honor of this month’s Unplugged Project theme of messages here are two simple methods for making secret, invisible ink messages out of ordinary ingredients.

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LEMON JUICE:

Either squeeze a lemon or be lazy like me and use that store bought lemon juice that comes in the little plastic lemon!  Put the juice in a small dish and use a cotton swab to write your secret message.

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BAKING SODA & WATER:

Mix together equal parts baking soda and water in a small bowl.  Again, use a cotton swab to create your message.

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Once the messages are completely dry and can no longer be seen on the paper, hold the paper over a heat source and the message will magically be revealed to guaranteed “oohs and aahs!”  (Obviously an adult should complete this step, especially with young children, so as to avoid burns and flaming paper.)

By the way, we found that the baking soda produced a slightly darker result than the lemon juice.

NOTE:

For those whose children channel James Bond rather than Martha Stewart, a high-tech invisible ink spy pen complete with built-in ultraviolet decoding light might be just the ticket. My son found this one in his Christmas stocking:

LINKS – More about invisible ink:
The Naked Scientist – Secret Messages-What Makes an Invisible Ink?
Kidzworld-How Invisible Ink Works
Science Project Ideas – Invisible Ink (this site has some other interesting methods too)

Secret Codes: The Cardan Grille (“Messages” Unplugged Project)

By , January 10, 2011 2:39 pm


My two oldest children are really into secret codes at the moment and when I asked them for suggestions for this month’s Unplugged Project theme, my 8 year-old son immediately said “Messages! We could make codes!”

So here is our first code, a version of the famous code known as the Cardan Grille.  For this code, a special template is used to encode and decode a message. Here’s how we made ours:

You’ll need paper (graph paper makes it much easier), a sharp pencil, scissors, a ruler, and a box cutter or razor blade.

First mark out evenly spaced boxes on your graph paper.  You will be cutting some of these into square openings, so you’ll have to leave some blank space around each box.  (Our boxes were two graph squares wide and two squares tall with one blank square between rows.)

First we marked off rows of squares then we drew the grid using the ruler.

Next we laminated our paper.  If you don’t have a laminator, you might want to paste it to some stiff cardboard or posterboard just to make it tougher.  If the grid gets lost or destroyed, no one can crack the code and you will be fired as a secret agent!

I used a box cutter to cut random squares out of the grid.  I put an old wooden clipboard underneath in order to avoid damaging the desk.  You could use pointy scissors for this step, but a razor-type blade makes the job much easier. (Obviously, an adult should do this step.)

The finished template (with my “helpers” in the background):

Now you are ready to encode.  Place the template over a fresh sheet of paper.  Mark around the corners with a pen to make it easier for the decoding person to line it up.  Write your message (one letter goes in each square).

Remove the template and fill in all the open squares with random letters.  Can you figure out what this says?

Here is the solution:

(“The girls are hiding the treehouse.” – OK, so it was supposed to say “The girls are hiding in the treehouse but we forgot the “in.” But coded messages are supposed to be brief, right?)

NOTES:

  • You can make your template as big or as small as you like.
  • For ease of communication between spies, you really ought to make a duplicate template so both sender and recipient have their own.  Just place the first template over a new piece of paper, trace the locations of the squares, laminate, and cut out.
  • I numbered the corners of the template 1 – 8 because you could use both sides and all four orientations to create different messages, or even one long one.
  • Traditionally, the template was placed over an ordinary letter (see the example here) but it can be very challenging to come up with a natural sounding message built around the coded text.  I gave it a try though and it was a fun mental exercise:

(“Arrival at six PM.”)

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