How does a matchstick get ignited by a magnifying glass?

To burn a matchstick using a magnifying glass, it is important to have the sun shining brightly so the we can concentrate its rays through the glass and onto the tip of the matchstick. This will cause the tip of the matchstick to burn.

Physics Graded Assignment (reg 29)

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1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90(degrees)?

When an object is placed between 2 mirrors at an angle less than 90 degrees, there will be more than 2 reflections. The lesser the angle, the more reflections there is.

2) What happens to the images of this angle is it is bigger than 90(degrees)?

When the angle is bigger than 90 degrees, there will be less than 2 reflections. The reflection will also show different views of the object when the angle is big.

3) How do mirrors produce funny images?

These funny images are formed by mirror that are usually found in a funhouse. Concave mirrors make us look tall while convex mirrors make us look short. Fat and thin reflections can be seen when the mirror sides are bent backward or forward.

Networking Project For Chemistry (reg. 29)

(1 ) Microwaved food is believed to contain microwaves. How safe is microwaved food ?

Microwaved food is definitely safe to be consumed, but it is bad to have it often, as it contains high amounts of fat and salt. Microwaves are used to make radio frequency waves that cook the food by making the water in it react so that it gets heated up and cooked easily. In my opinion, I only microwave food when I am in a hurry. It is better to avoid making a habit out of it as it is unhealthy.

2) Reports have linked charred food to cancer. How safe is BBQ food ?

BBQ food is safe to be eaten, but it is unhealthy. After cooking the food, there could be burnt bits that appear on the food. Burnt bits of food are believed to be carcinogenic - which causes our cells to become cancerous. To avoid the chances of getting cancer, we should avoid eating BBQ food at all, or we can cut off any burnt portions just to be safe.

E Learning part 3. (Reg. 29)

1. Why does the sun make your skin dark but your hair light?

From my research, I've found out that there is a chemical in our skin called melanin. This chemical is released when or skin is exposed to the sun. This is the main reason why there are people who are tanner than others. Melanin is also found in our hair. As our hair has dead cells, the sun bleaches and destroys the melanin in our hair, making it lighter. As our skin is alive, it responds more to the sun by producing more melanin and becoming darker.

2. If vegetables have no fat, why is vegetable oil all fat?

It is true that all vegetables have fat, but they have more unsaturated fat while the fat found in animals is much more saturated. The fat in vegetable oil is definitely much healthier than the fat in animals.

3. Cockroaches are one tough animal. If you cut the head off of a cockroach, it could live for a month without it. And don't try drowning it. The cockroach can hold its breath for 40 minutes!
Find out why & how does the cockroach do that!

Cockroaches do not breathe using their mouths. Instead, they breathe through a system of tubes attached to the spiracles (small openings on the surface of some animals that usually lead to their respiratory systems.) They only die because they have no head to eat with! The reason that they can hold its breathe so long is that, they shut their spiracles and stop breathing. They do this often on land to prevent oxygen from entering, as too much of it can be toxic to them.

-Syaheeran(:

E Learning Part 2

The picture above shows an imaginary creature with webbed feet. This tells me that the creature is probably a good swimmer and lives in the sea. This creature is also probably a carnivore as it has big wide ears and a long nose to lead it to its prey. It also has a long tongue similar to a frog or a lizard, and sharp teeth. The spikes on its back are similar to a hedgehog's. It is probably used for defense from other predators. Being a carnivore, this creature probably plays the role of a predator.

-Syaheeran

Invention of air conditioners

The invention that I had always been interested in is the Air Conditioning. An air conditioner is a home appliance which is designed to dehumidify and to cool an area. It was first invented by Willis Haviland Carrier since the 1900s. The air conditioner is used by people everyday especially when the weather is always humid like in Singapore.

The concept was applied back in Ancient Rome, where water supply was circulated in the walls of houses to cool them during the warm seasons.


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Air conditioners are usually positioned high near the ceiling of the room. The air in front of the air conditioner will get more dense and cooler. The more dense air sinks while the less dense air rises. This cycle is repeated until the whole room is cooled.

I feel that this invention is wonderful because without it, many of us would have to put up with the heat in Singapore.

-Syaheeran, 3e3