Mr Lim said someting about lower potential to higher potential. One of them is in Taitung, Taiwan and Guatemala, Mexico and there is one more but i'm not exactly sure. i got this video and it's pretty clear and not blurry at all. Enjoy! :)

The reason why red is on top of the spectrum of colours is because of the different wavelengths and frequency of the light. This is the asnwer:

Red is at the lower end of the spectrum and has a higher wavelength but lower frequency to that of Violet at the top end of the spectrum which has a lower wavelength and higher frequency.
taken from: http://www.colourtherapyhealing.com/colour/

What they're trying to say is that red vibrates lesser than violet (frequency) and that red has a longer wavelength than violet (wavelength). i'm sorry but i can't find a video for frequency and wavelength. Apologies! :)

A solar eclipse is caused when the moon passes between the Earth and the Sun, causing the Sun to be fully or partiall covered. Every year, at least two to five solar eclipse occurs.

There are four types of solar eclipses:
-A total eclipse occurs when the Sun is completely obscured by the Moon. The intensely bright disk of the Sun is replaced by the dark silhouette of the Moon, and the much fainter corona is visible. During any one eclipse, totality is visible only from at most a narrow track on the surface of the Earth.

-An annular eclipse occurs when the Sun and Moon are exactly in line, but the apparent size of the Moon is smaller than that of the Sun. Hence the Sun appears as a very bright ring, or

annulus, surrounding the outline of the Moon.

-A hybrid eclipse (also called annular/total eclipse) transitions between a total and annular eclipse. At some points on the surface of the Earth it is visible as a total eclipse, whereas at others it is annular. Hybrid eclipses are comparatively rare.

-A partial eclipse occurs when the Sun and Moon are not exactly in line and the Moon only partially obscures the Sun. This phenomenon can usually be seen from a large part of the Earth outside of the track of an annular or total eclipse. However, some eclipses can only be seen as a partial eclipse, because the

umbra never intersects the Earth's surface, passing above the Earth's polar regions.

And here's a video from Jakarta about on a solar eclipse:

and an explanation on why solar eclipse can only be seen in some countries:

On 8 january, Mr Lim did an experiment.
He placed a test tube inside of a boling tube.



Then he poured glycerine into it. The test tube filled up first but when the glycerin started to fill up in the boiling tube, the test tube sort of disappeared from sight. So here's the research i done about what actually happened:
We see the edges of objects because light is either reflected or refracted into our eyes. The glycerin and the test tube both have the same reflective index. This means that that the light is not refracted when it crosses the boundary between the glycerin and the glass. And because both of them are transparent, the boundary between the two test tubes cannot be seen and thus, it looks like the test tube disappears when in actual fact, it does not.

What is reflective index or index of refraction?

Well, the refractive index (or index of refraction) of a medium is a measure of how much the speed of light (or other waves such as sound waves) is reduced inside the medium.

taken from: http://en.wikipedia.org/wiki/Refractive_index

Here is a table of some common material index of refraction:

Vacuum
1.00000
Air at STP
1.00029
Ice
1.31
Water at 20 C
1.33
Acetone
1.36
Ethyl alcohol
1.36
Sugar solution(30%)
1.38
Fluorite
1.433
Fused quartz
1.46
Glycerine
1.473
Sugar solution (80%)
1.49
Typical crown glass
1.52
Crown glasses
1.52-1.62
Spectacle crown, C-1
1.523
Sodium chloride
1.54
Polystyrene
1.55-1.59
Carbon disulfide
1.63
Flint glasses
1.57-1.75
Heavy flint glass
1.65
Extra dense flint, EDF-3
1.7200
Methylene iodide
1.74
Sapphire
1.77
Rare earth flint
1.7-1.84
Lanthanum flint
1.82-1.98
Arsenic trisulfide glass
2.04
Diamond
2.417

We haven't learn refraction yet but we're gonna learn it in the next lesson. You can learn it earlier by watching this very interesting video:

and... this is a revision of reflection:


and this is reflection - again. But it is more about light sources, how light enters our eyes and etc.


Enjoy :)

Right, now i'm doing the hardest question that Mr Lim gave us: why do some lifts operate ONLY when you press your finger on it but you can't do so with a glove? Like stella, i got the same problem as her: i don't know what is the answer. Its very hard to type in the whole question in google and yahoo. i get some very strange results. But Li shan managed to get the answer and i'm quite impressed by how she managed to get it. But i had made my own ''assumptions'' before i read Li shan's blog so you may read my ''asumptions'' and laugh. Its ok.

Assumption 1: The lift is programmed to ONLY recognize human fingerprints. Probably Japan has alot of animals living in it so thats why they created this system.

Assumption 2: The glove's material is nothing like human skin so the lift is programmed not to respond when gloves touches it. Probably the reason why they did this cause sometimes people accidentally lean on the lift button so they changed it to this unique lift system.

After looking at Li shan's answer and comparing it to mine, you can see there's quite alot of difference. One is logical and the other is illogical. At least my previous post is better than this one, so look at my previous post, its about the ice thing. :)

(read the title then read the post, please) Hmm, i had this experience before. Luckily, i managed to get my finger out before any real damage was done to my skin. So here's the explanation i found - summarised:

When the skin touches the ice, the body secretes tiny amounts of sweat as the ice is very cold. When i mean cold, i mean the temperature that ice melts: 0 degrees celsius. Before i continue, i need to explain something about sweat. Sweat is a salty substance that makes your skin sticky so thats why you feel very sticky after you have exercised. Sweat too, is also use for grip. Confused? Let me explain, and give you an example: a gecko. This is a picture of a gecko's pad (which means the feet)



In order for the gecko to say, climb up a wall, it needs to secrete a fluid that enables it to stick on the wall. So its the same for humans, just that we humans can't climb up a walls (except spiderman, but he's half spider so that doesn't count). Do note that the 'sweat' in humans and the 'sweat' in lizards are very very different.


Ok, back to the topic, since there's liquid on your skin, it only makes sense that the liquid freezes the liquid on your finger and as liquids have no definite volume, it can cover all the nooks and cranny on your finger and thus causing the ice to stick to your finger. If you were to pull out your finger strongly, your skin would be ripped as the frozen sweat is connected to your skin. But, if your finger gets stuck in an ice cube, its ok, because the body also gives out heat energy and it usually melts the frozen sweat back into liquid sweat.

You know, you really got to feel sorry for those living in Antartica cause the temperatures over there are plunging low and any contact with liquid and the cold and turns it instantly to a solid(ice). Wow, they must really take alot of percautions then but at least they don't have any NAPFA test. ;D