Science Projects - Christian Parent

Archive for the ‘Science Projects’ Category

How to Make a Crawdad Trap

Our boys have had a lot of fun swimming in the river behind our house this summer. There are all kinds of things to look at and explore, so many creatures to discover.

This year my boys discovered crawdads for the first time. They look like little crabs, but you can find them in even tiny rivers like ours. They are really fun to try to catch, some people even eat them!

crawdad trapIt is really easy to make a trap to capture crawdads.

Supplies needed:

  • 2-liter pop bottle
  • Exacto knife
  • String
  • Canned clams

The first thing you need to do to create the trap is cut the top off of the bottle. Using the exacto knife, carefully cut the top third of the pop bottle off. You want to cut it at the top of the center portion of the bottle, right where the bottle begins to narrow.

Turn the part you cut off upside down and place it inside the bottle, so that the cut edges meet and the top of the bottle is now inside of the bottle, near the bottom of the bottle.

Use the knife to cut two slits at the top of the bottle, one on each side. Cut a long piece of light rope or string and string it through the two holes, tying it at the top. This gives you a hanger to hang the bottle from.

Place about half a small can of clams down through the hole, to the bottom of the bottle.

Your crawdad trap is all ready to try out! Hang the bottle from a tree branch or other secure place with the bottle entirely submerged in the water. You can place a few small rocks in the bottom of the bottle to help keep it in the water.

Have your kids check the trap every day and see if they caught any crawdads! And if you are brave enough, do a search to find out how to cook them and eat them.

Copyright 2015, This article may not be reprinted.

Bubble Snake

My boys have been having a lot of fun trying out science experiments that they have seen on YouTube. Just search “bubble snake” on YouTube and you will see bubble snakes of all sizes, shapes and colors.

bubble snakeThis experiment is very easy. All you need is:

  • Water bottle
  • Food coloring
  • Wash cloth
  • Bubble solution
  • Shallow bowl
  • Rubberband
  • Sharp knife

Use a sharp knife or scissors to cut the bottom off of the water bottle.

Wrap the wash cloth around the bottom of the water bottle and hold in place with a rubber band.

Place an inch or so of bubble solution in the shallow bowl. Add some food coloring if you want a colored snake. You can also put food coloring directly on the wash cloth (make sure to use an old washcloth for this activity).

Dip the wash cloth in the bubble solution and blow through the drinking end of the water bottle and watch your bubble snake grow and grow!

This is a fun activity to do on a rainy day or anytime your kids need a break from watching YouTube. See more of our fun science experiments in the related posts below.

Here’s the video we made of our bubble snake.

Copyright 2015, Christian This article may not be reprinted.

Homeschool Science: Milk and Soap Magic


My boys have been wanting to try this experiment for awhile. They first saw it on YouTube when they were watching science videos made by Doctor Mad Science. This experiment involves the reaction between milk and dish soap.

For this experiment you will need:

  • Pie pan
  • Milk
  • Food coloring
  • Liquid dish soap
  • Q-tip

The key to this experiment is the reaction between the milk and the dish soap, however, you will need food coloring to see this reaction in action.

milk and soap magic

Have your child pour some milk into a pie pan, just enough to cover the bottom of the pan. Wait until the bubbles in the milk pop before proceeding.

Next place several drops of food coloring in the milk. Several different colors work best. Next take a q-tip and dip it in liquid dish soap.

Have your child slowly dip the q-tip into the food coloring in the pie pan. The dish soap on the q-tip will react with the milk, causing the food coloring to disperse through the milk. The food coloring will go in all directions, making really cool swirled patterns in the milk. One of my boys thought his looked like the Death Star from Star Wars.

If you want a more scientific description of the chemical reaction that is occurring, then check out this more detailed explanation.

Make sure to check out the YouTube video my boys made to demonstrate this fun experiment.

Copyright 2014,

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Homeschool Science: Are Sounds Louder Under Water?


My boys and I recently watched Bill Nye the Science Guy’s video about Marine Animals. We learned a lot of great facts, such as how a whale or dolphin’s blubber keeps it warm.

water and soundWe have actually performed that experiment by coating a thermometer with vaseline and placing the thermometer in cold water. The vaseline acts as a protective or “blubber” layer, keeping the temperature of the thermometer lower than it would be otherwise.

Bill Nye showed another fun marine animal experiment to try. This one was about how sound travels underwater. In the experiment there were two drinking glasses, one filled with water, and one empty.

Supplies Needed:

  • Two drinking glasses
  • Table knife

Have your child put their ear inside the top of the empty drinking glass. Have them gently tap the side of the empty glass (the glass needs to be made of glass, not plastic) with the table knife.

Make sure the glass with the water in it is full all the way to the top of the glass. Have your child put their ear in that glass, with their ear fully in the water.

Next have them tap the side of the glass with the table knife.

Have them compare the sounds they hear in the two glasses. The sound inside the glass filled with water should be much louder.

Explain to your child that sounds are louder in water than out of water because water is denser than air, making water a better conductor of sound. Sound also travels through water faster than through air.

Here is another fun fact. Did you know that sound has to have a medium to pass through? Sound has to pass through a solid, liquid, or gas in order to be heard. In outer space these things don’t exist, everything exists in a vacuum, therefore sounds cannot be heard in outer space. Interesting!

If you want more technical information on this topic, check out:

Copyright 2014, This article may not be reprinted.

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Science for Kids: How to Make an Egg Float in Water


This is a fun, easy science experiment for kids. Have your child place an egg in a glass of water and see what happens. The egg will sink (if it is a fresh egg it will sink, a “bad” egg will actually float in water!).

egg experimentIn this experiment you will show your child that you can actually make an egg float in water by adding salt to the water. For this experiment you will need:

  • Tall glass
  • Egg
  • Table salt

Have your child place about 6 tablespoons of table salt in the bottom of a glass. Gently pour at least a cup (depending on the size of the glass) of hot water into the glass. Don’t stir it.

Next place the egg in the glass and watch it float! If the egg is not floating, just add some more salt to the glass. If the salt stays at the bottom of the glass the egg will actually float in the middle of the glass. If you stir the salt into the water, the egg will float at the top of the water.

Why does this work? Salt water is more dense or “heavier” than regular tap water, which makes it easier for the egg to float in the water. Did you know that you can actually float more easily in salty ocean water than in a lake?

To further experiment, try placing another object in the glass, such as a marble. Discuss why the egg is floating and the marble does not, even with the salt in the glass.

Copyright 2014, This article may not be reprinted.