To begin the lesson the teacher asked:  What is science?  What do scientists do?  A discussion ensued and then a video was shown to the pupils. To learn more about the scientific process they took part in an investigation.  The teacher showed the students two eggs and posed the following questions:  Will the eggs float or sink?  Why do you think so? Students stuck a sticky note under the headings:  Will float/ Will sink.  Some students were undecided as they thought that one egg could sink while the other could float. Therefore, they stuck their sticky note in the middle.  I poured some water in the glasses.  After, students explained why they thought the egg would sink or float. 

Some students observed the eggs and explained that since one egg looked larger than the other it would sink while the other would float.  Others pointed out that the egg shell of one egg could be thicker than the other and therefore one may sink and the other may float.  Both eggs sank, but one sank to the bottom and sat on its side while the other sank but floated at an angle.  The teacher asked the question:  Which egg is fresher?  Students observed ad discussed.  The egg that sank to the bottom was fresher.  We also discussed that if the egg was not fresh it would float because when an egg ages, the shell becomes more porous allowing air to flow through. The more air entering through the shell, the larger the air cell becomes.  The air sac, when large enough, makes the egg float.  Students were eager to tell their parents/guardians about this investigation and their findings.

Submitted by Ms Miranda Cauchi, Yr 3.2 Teacher