Wednesday, April 30, 2008

Night Sky, Moon, Eclipse

Marcus Garvey School of Thought


Home Science Tools

The Case of the Disappearing Eggshell

An egg is covered by a hard shell to help protect the chick growing inside. When the chick is ready to hatch, it breaks the shell open. Try this experiment to find out what a shell is made of:

What You Will Need:

An egg from the grocery store
A drinking glass
White vinegar
What To Do:

Set a raw egg in a glass of white vinegar so that it's completely covered in the liquid. Bubbles should start to form on the surface of the egg.

Let the egg sit in the vinegar for about 3 days and then take it out and rinse it in water, being careful not to pop it. Does it feel different from when you put it in the vinegar? Does it still have a white shell?

What's Happening?

The eggshell disappeared! But there might be some chalky white stuff left on the egg. This is because vinegar is a type of acid that "ate" away and dissolved the calcium carbonate that the shell is made out of. (Chalk is also made out of calcium carbonate!) When something dissolves, it breaks into very tiny pieces and mixes with a liquid. You can see it happening if you put a sugar cube into a cup of hot water and stir. The sugar cube disappears as the sugar dissolves into the water.

You might be wondering why the egg white and yolk inside the shell stayed in the shape of an egg even though the shell is gone. This is because the egg has another covering underneath the shell; called a membrane. It is very thin and you can see the yellow yolk through it. The vinegar can't dissolve the egg membrane, but some of it was able to get through the membrane, making the egg swell up.

Shrinking Egg

In the last project, the egg membrane let liquid in, making the egg swell a little bit. Do this project to see if you can get the egg to shrink!

What You Will Need:

The egg without its shell from the previous project
A drinking glass
Corn syrup
What To Do:
Carefully place the egg in a glass of corn syrup, so the egg is covered.
Let the egg sit in the corn syrup for about 3 days. Then take it out and see what happened!

What's Happening?

The egg shrank! This is because the egg membrane let a bunch of water pass out of the egg to try to balance how much water was inside the egg and how much water was outside it in the glass. The very tiny parts that make up corn syrup (called molecules) were still too big to pass through the membrane, so none of the corn syrup got inside the egg. The egg lost a lot of water, but didn't get anything to take the water's place, so it looks a little funny! Do you think it would fill up again if you put it in a glass of water? Try it out!

The fact that the egg membrane can let some things through is very important for a baby chick. Air passes through the membrane, just like water did in this experiment, and that allows the baby chick to breathe while it's inside the egg.

Marcus Garvey School of Thought

Origami Day

Origami and Photography by Warrior Princess Z and Warrior Princess T

Marcus Garvey School of Thought

Saturday, April 26, 2008

Riddle Me This

1. A man spends one fifth of the money in his wallet. He then spends one fifth of what remains in the wallet. He spends $36.00 in all. Question: How much money did he have to begin with?

2. Y Y U R Y Y U B I C U R Y Y 4 M E

3.My brother, the local bus driver, was telling me that recently he was driving a bus full of people and no-one got off on the way. However, at the end of the journey, there was not a single person left on the bus. How?

4.Food Item: You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What did you eat?

5. A drawer contains ten brown socks and ten black socks. Question: How many socks must you remove (in total darkness) before being sure of having a pair of brown socks?

Looking forward to seeing your answers.


Monday, April 21, 2008

A Credo For My Relationships With Others

A Credo For My Relationships With Others
by Dr. Thomas Gordon

You and I are in a relationship, which I value and want to keep. Yet each of us is a separate person with unique needs and the right to meet those needs.

When you are having problems meeting your needs I will listen with genuine acceptance so as to facilitate your finding your own solutions instead of depending on mine. I also will respect your right to choose your own beliefs and develop your own values, different though they may be from mine.

However, when your behavior interferes with what I must do to get my own needs met, I will tell you openly and honestly how your behavior affects me, trusting that you respect my needs and feelings enough to try to change the behavior that is unacceptable to me. Also, whenever some behavior of mine is unacceptable to you, I hope you will tell me openly and honestly so I can change my behavior.

At those times when one of us cannot change to meet the other's needs, let us acknowledge that we have a conflict and commit ourselves to resolve each such conflict without either of us resorting to the use of power to win at the expense of the other's losing. I respect your needs, but I also must respect my own. So let us always strive to search for a solution that will be acceptable to both of us. Your needs will be met, and so will mine - neither will lose, both will win.

In this way, you can continue to develop as a person through satisfying your needs, and so can I. Thus, ours can be a healthy relationship in which both of us can strive to become what we are capable of being. And we can continue to relate to each other with mutual respect, love and peace.

Monday, April 14, 2008

Baby Chick!

Some egg experiments coming your way soon! Until then, enjoy this chicky video and some cute jokes, that will be sure to crack you up!

Did you hear the joke about the broken egg?

Yes, it cracked me up!

What do chicks do in science class?


Who tells the best chicken jokes?


Learning all the time,
Marcus Garvey School of Thought