Science Week came early to NLPS! This year we were very lucky to be part of a robotics incursion that was sponsored by Toyota. The company is called Robokids and the Melbourne based branch is run by Claire Grady who used to be a teacher at our school.  All feedback about the day was amazing! The 3-6 children spent the day writing code to program a Lego robot to do all sorts of things, from navigate a maze to dance and even robot wars.
The grade 1/2 children built a little robot called Milo and wrote code for how to move her.
The Prep grades were introduced to The Bee Bot and created a code for it to move.

Make an Egg Float in Salt Water

An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what happens if you add salt? The results are very interesting and can teach you some fun facts about density.

What you'll need:

  • One egg
  • Water
  • Salt
  • A tall drinking glass 


  1. Pour water into the glass until it is about half full.
  2. Stir in lots of salt (about 6 tablespoons).
  3. Carefully pour in plain water until the glass is nearly full (be careful to not disturb or mix the salty water with the plain water).
  4. Gently lower the egg into the water and watch what happens.

What's happening?

Salt water is denser than ordinary tap water, the denser the liquid the easier it is for an object to float in it. When you lower the egg into the liquid it drops through the normal tap water until it reaches the salty water, at this point the water is dense enough for the egg to float. If you were careful when you added the tap water to the salt water, they will not have mixed, enabling the egg to amazingly float in the middle of the glass.


Taste Testing Experiment


We are learning how some foods taste better than others.




A small piece of peeled potato

A small piece of peeled apple (sample shape as the potato so you can’t tell the difference)

Paper plate


  1. Close your eyes and mix up the pieces of potato and the pieces of apple so you don’t know which is which.
  2. Hold your nose and eat each piece, can you tell the difference?


What are our senses on our body?

Which sense do we use for tasting food?



This makes it hard to tell the difference between the two foods. The nose and mouth are connected through the same airway which means that you taste and smell foods at the same time. Our sense of taste can recongnise salty, sweet, bitter and sour but when you combine the with your sense of smell you can recongnise many other individual tastes. Take away the smell and sight and you limit your brains ability to tell the difference between certain foods.


Invisible Ink with Lemon Juice

Making invisible ink is a lot of fun, you can pretend you are a secret agent as you keep all your secret codes and messages hidden from others. All you need is some basic household objects and the hidden power of lemon juice.


What you'll need:

  • Half a lemon 
  • Water
  • Spoon
  • Bowl
  • Cotton bud
  • White paper
  • Lamp or other light bulb


  1. Squeeze some lemon juice into the bowl and add a few drops of water. 
  2. Mix the water and lemon juice with the spoon. 
  3. Dip the cotton bud into the mixture and write a message onto the white paper. 
  4. Wait for the juice to dry so it becomes completely invisible. 
  5. When you are ready to read your secret message or show it to someone else, heat the paper by holding it close to a light bulb. 


What's happening?

Lemon juice is an organic substance that oxidizes and turns brown when heated. Diluting the lemon juice in water makes it very hard to notice when you apply it the paper, no one will be aware of its presence until it is heated and the secret message is revealed. Other substances which work in the same way includes orange juice, honey, milk, onion juice, vinegar and wine. Invisible ink can also be made using chemical reactions or by viewing certain liquids under ultraviolet (UV) light.


Milky Way Experiment


We are learning about the reaction of different things




Food colouring

Dish washing liquid

Cotton buds

Plastic plates

White paper


To Do:

  1. Put milk into the plastic plate
  2. Add all four of the different the food colouring to the milk
  3. Drop small amounts of dishwashing liquid and watch what happens.




Tornado in a bottle Experiment


We are learning how to make a Tornado.




A clear plastic bottle with a cap (that won’t leak)


Dish washing liquid


To Do:

  1. Fill the plastic bottle with water until it reaches around three quarters full
  2. Add a few drops of dish washing liquid
  3. Sprinkle a couple pinches of glitter (this will make your tornado easier to see)
  4. Put the cap on tightly
  5. Turn the bottle upside down and hold it by the neck. Quickly spin the bottle in a circular motion for a few seconds, stop and look inside to see if you can see a mini tornado forming in the water. You might need to try it a few times before you get it working properly.



Our visit to the science lab

Today we visited Emmanuel College’s science lab and had their science teacher take us for an hour science lesson on the States of matter. We have been learning about gas, liquids and solids in class and were excited to have an opportunity to use a real lab. Like a true scientist we wore gloves and white labs, although by the end of our liquid experiment some of us were also wearing the coloured liquid on our coats. Another experiment we did was the gas one, we had to see what happened when we squished a ball with a net around it. Some of the answers were: the gas inside the ball tried to escape out the net causing it to make bubbles. There were rubik cubes at the science lab. Some people played with the rubik cubes and one team solved it. We worked with dyed water and one of the teams had grease in their cup so when there wasn’t much water in the cup it would stay in a bubble.

By Poppy M and Ibby S