Let’s make a soap bubble with your kids.

Let’s make a soap bubble with your kids. 
 
1. Firstly, let’s make the liquid for the soap bubbles. 
The recipe calls for 50 cc of hot water, 40 cc of liquid starch and 10 cc of 
detergent for kitchen. 
You should stir them. 

2. Let’s make the soap bubbles at the park neighbor. 

You can easily make it by using a straw, a small loop and something with 
multiple holes. 

 

Hope you and your kids enjoy the playing. 

Let’s play magnet with your kids.

1. Setup two or three sets of magnets on the carpet. 
Let’s touch “N” or “S” of two magnets each other. 
If your kids find that “N” of the magnet likes other “S”, let’s gather iron sand 
at the park nearby. 

 
2. Likewise, setup a compass on the table. 
(Parents should be aware of other magnetic fields.) 
Let’s observe that the compass indicates the North Pole of the earth. 

4. Next, move “N” of the magnet near to the compass, and observe what happened 
to the compass needle. 
If “S” of the magnet is moved near to the compass, what happened? 
Your kids can understand the needle of the compass is “N” of the magnet. 

Magnetic field is attractive physics. This technology can produce linear motor 

car, magnetic resonance imaging, or so. 

Hope you and your kids enjoy the exam. 

The difference between kleenex and toilet paper

Do your kids understand the difference between kleenex (also known as tissue 

paper) and toilet paper? 
 
Yes. Toilet paper is easily soluble. 
 
Let’s test it if this is true. 
 
1. Set the two glasses of water, kleenex, and toilet paper as shown in here. 

Left paper is toilet paper, and right one is kleenex.

2. The kleenex and toilet paper sink in the water. 

3. Stir it. 

If you can observe the difference of two papers, your kids would understand that 
we must not use the kleenex paper in the toilet. 
 
Hope you and your kids enjoy the exam. 

Let’s float a raw egg with your kids.

A raw egg doesn't float in water, but it can float in salt water. 
 
1. Set the glass of water and a raw egg on the table. 



2. A raw egg sinks in the water. 



3. Add salt to the water, and observe that the raw egg floats. 


4. Pour in small amount of plain water, and observe where the raw egg goes. 

Look at the drifted egg in water.

If you can observe the floating and drifting egg successfully, let's learn “Dead Sea” in Jordan. 
Dead Sea is 8.6 times saltier than the ocean. 
This salinity makes for a pitiless environment in which animals cannot live. 
 
Hope you and your kids enjoy the exam. 

Your height in supine position

Have you ever measured your height in supine position? 

If you haven’t, let’s compare your height in supine and erect position! 

My daughter and I measured our height in supine and erect position. 

My daughter’s height 

Erect: 113.0 cm, Supine: 115.0 cm 

My height 

Erect: 170.5 cm, Supine: 172.5 cm 

Awesome! Our height increased by 2.0 cm in supine position. 

This result is not unusual if you learned in the field of medicine. 

Here is a tip. 

Your intervertebral disc works like a sponge. 

Astronauts wear their spacesuits whose size is larger than their clothes, 

because their height increases in the field of zero gravity. 

Hope you and your kids enjoy the exam.

Let’s make a rainbow in your living room with your kids.

1. Fill a glass or acrylic case of water and setup on the table. 

2. Turn on a flashlight with a slit. 

   Although the slit is not necessary to make your rainbow, but it’s desirable. 

3. Shine the light across the water. 

   Then, the tilt angle of approximately 20 degrees would be effective. 

Can you observe the red to blue light (visible spectrum)? 

Let’s learn the blue light has relatively large refractive index than for red. 
 
We can understand why the sky of the sunset is red, or why the sky is blue. 
Here is a tip. Let’s consider the length of atmospheric layers. 
 
Hope you and your kids enjoy the exam.