Spring and eggs just seem to go together.This is because eggs are a symbol of fertility,thus the perfect symbol for spring,which is a time of birth and growth.One of the many egg experiments that amazes kids of all ages is testing the strength of eggshells.
Eggs are easily cracked if hit on the side,but the dome-shaped ends will support a great deal ofweight.This is becauseweightpushing down on top of the domed-shaped egg doesn't push straight down,instead theweightspreads outward along the curve of the egg.
The photo is of Dawn Shock,a fun lady who presents science programs for kids and educators.You can find out about Dawn's "Grandma's Science " programs at :www.grandmascience.com
Dawn has a stack of books resting on 4 empty eggshells.Following are instructions for preparing the eggshells:
1.Use the edge of a spoon to carefully break off the small end of each eggshell.If any cracks form up the side of a shell,discard it and use another egg.
2.Shake out the contents of each egg into a bowl,then rinse the inside of the eggshells with water.Carefully dry the outside of the shells with a paper towel.
3. In order to have the eggs the same height and even on the bottom edges, wrap a piece of masking tape around each egg.The position of the tape should be the same on each shell.
4.Use scissors (fingernail scissors work best) to cut away the broken ends of the shell from around the bottom of the tape on each shell.
5.Place a book on top of the shells,and position the shells so that one is under each corner of the book.
6.Carefully add books,one at a time to the book on top of the eggshells,waiting a few seconds before adding the next book.
Ostrich Eggs are strong and great for observing the
physical properties of matter.Source for Ostrich Eggs
Note: The texture on the Ostrich Eggsis natural.
Structural Engineers design and build many different things,such as egg cartons.But a person doesn't have to have a degree in engineering to invent something.This is true for the person who invented the egg carton.History Of Egg Cartons.