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by: ldonis
Monday 16th , 2012

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290 The hunt was definitely on at Kidspace last Sunday with over 600 kids searching for thousands of eggs hiding throughout the gardens.  It was a very egg-y day with science egg-speriments and egg noodle art.  Kids hopped around with bunny ears too! What makes special events at Kidspace special?  Where else can you turn an egg hunt into a science lesson?  How many ways are there to incorporate eggs into art projects?  It’s never a typical day for you or your little ones when creating colorful collages, inspecting interesting insects, or trucking along the tricycle tracks at a Kidspace special event.  Learning with play doesn’t need to stop when you leave Kidspace either!  We want you to continue the fun at home, which is why Kidspace strives to provide programs that are simple and fun for all and can be done almost anywhere. 

From Steve Spangler Science - Here are a few egg-speriments you could try at home, just in case you aren’t all egged out yet!

Squeeze an Egg Without Breaking It
Eggs are amazingly strong despite their reputation for being so fragile. Place an egg in the palm of your hand. Close your hand so that your fingers are completely wrapped around the egg. Squeeze the egg by applying even pressure all around the shell. To everyone's amazement (mostly your own) the egg will not break. If you're a little nervous about the outcome, try sealing the raw egg in a zipper-lock bag before putting the squeeze on it, or hold the egg over the sink if you're in the super-brave category.

Now hold the egg between your thumb and forefinger and squeeze the top and bottom of the egg. Are you covered in egg yolk? Why not?

Finally, hold the egg in the palm of your hand. Press only on one side of the shell. Do not squeeze the egg - just press on the side. Uh oh. Why do you think that happened?

The egg's unique shape gives it tremendous strength, despite its fragility. Eggs are similar in shape to a 3-dimensional arch, one of the strongest architectural forms. The egg is strongest at the top and the bottom (or at the high288 est point of the arch). That's why the egg doesn't break when you add pressure to both ends. The curved form of the shell also distributes pressure evenly all over the shell rather than concentrating it at any one point. By completely surrounding the egg with your hand, the pressure you apply by squeezing is distributed evenly all over the egg. However, eggs do not stand up well to uneven forces which is why they crack easily on the side of a bowl (or why it cracked when you just pushed on one side). Be careful not to wear a ring while performing our squeezing act. The uneven pressure of the ring against the shell will result in an amusing display of flying egg yolk for your audience members. This also explains how a hen can sit on an egg and not break it, but a tiny little chick can break through the eggshell - the weight of the hen is evenly distributed over the egg, while the pecking of the chick is an uneven force directed at just one spot on the egg.

The Floating Egg
It's so simple and amazing. A raw egg will float in very salty water but will sink in plain tap water. Why? Salt water is more dense than regular water. You'll need to make a very saturated salt solution by dissolving roughly 4 tablespoons of salt in about 2 cups of water. Use pickling or Kosher salt to make a clear salt solution. Table salt may be used, but the solution will be somewhat cloudy due to the additives used to make the salt free-flowing.

Fill a glass half full with the salt water. Slowly add plain water by pouring it down the sides of the glass, being careful not to mix the two liquids. Gently drop the egg into the water and watch as it sinks through the plain water, only to abruptly stop when it hits the salt water. The egg floats on the top layer of the salt water.

The Rising Egg291
Fill the bottom 1/5 of a tall glass with salt. Add just enough water to make a wet salt layer. Carefully lower an egg down on top of the wet layer of salt. Slowly add more water by pouring it down the sides of the glass so as not to disturb the bottom layer of water. Cover the top of the glass with cellophane and a rubber band. Notice how the egg rests on the layer of undissolved salt on the bottom of the glass.  Be sure to put the glass in a place where no one will be able to disturb it. Observe for weeks. That's right, weeks. Months even! Over the course of the next several weeks, the bottom layer of salt will begin to dissolve in the water above it. As the salt dissolves, the egg will rise off the bottom and float on the layer of salt water. As more time passes, the salt level continues to drop and the egg continues to rise. Be sure to put the glass in a place where no one will be able to disturb it. Record the egg's progress by marking on the outside of the glass using a felt tip marker. 

 

 

 

 

 

 

 

 

 

 

 

 

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Blog Entry by:

Julianne Sando, Special Events & Birthdays Coordinator, has been with Kidspace for over five years and in that time has helped implement unforgettable special events for thousands of children and families visiting Kidspace.  Prior to Kidspace, she worked as a camp counselor, after school program educator, soccer coach, and Peace Corps Volunteer in Zambia.