Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned-out stellar remnant. With no outward forces to oppose gravitational forces, the remnant will collapse in on itself. The star eventually collapses to the point of zero volume and infinite density, creating what is known as a "singularity." Around the singularity is a region where the force of gravity is so strong that not even light can escape. Thus, no information can reach us from this region. It is therefore called a black hole, and its surface is called the "event horizon."

But contrary to popular myth, a black hole is not a cosmic vacuum cleaner. If our Sun was suddenly replaced with a black hole of the same mass, Earth's orbit around the Sun would be unchanged. Of course, Earth's temperature would change, and there would be no solar wind or solar magnetic storms affecting us. To be "sucked" into a black hole, one has to cross inside the Schwarzschild radius. At this radius, the escape speed is equal to the speed of light, and once light passes through, even it cannot escape.

Garlic

Benifits
-Daily doses may help to lower blood pressure and blood cholesterol
-Acts as a nasal decongestant
-Has antiviral and antibacterial properties

Drawbacks
-Makes the breath smell
-May induce migraines
-Occasionally causes contact dermatitis

Herbalists and naturopaths regard garlic as something of a miracle food and use it as a remedy for dozens of complaints , ranging from asthma to arthritis. Garlic's reputation has some basis in truth, and the bulb's healing properties - as an antiviral and antibacteria agent- are now backed up with scientific evidence.

Garlic can be eaten raw in order to reduce nasal congestion as well as to help to relieve the other symptoms of a cold. The medicinal properties of garlic are the result of the sulphur compounds it contains, including those that are responsible for the pungent odour released when a bulb is crushed. There is some dispute as to whether garlic offers the same health benefits when eaten cooked as when taken raw, as many of the volatile components are lost through cooking.

In several studies scientists have shown that the compounds in garlic are good for the heart : they lower blood presssure , suppress cholesterol production in the liver , reduce harmful cholesterol and raise levels of the beneficial high- density lipoproteins in the blood.

optical illusions

Recently I grew interest in optical illusions and did some research.

Optical illusion is obtained in a lot of different ways.

Motion and time

This form of illusion is caused by using the characteristics of colours and move round with them.

(As i do not know how to upload an flsh document so i would not be uploading any examples.)

Luminance and contrast

By using the contrasting colours, the images create illusions to the eyes

Colour illusions are caused by the playing around with colours. (Obviously) It uses colours of similar pigments to create illusions of other colours.

Angle and geometric illusions

Space, 3D and Size constancy

Cognitive -/Gestalt effect

Specialties with faces

All above are the topics of visual illusions

food to eat for fever above or below the average.

Recently I fell ill. I had a fever and my parents did not know what to feed me. After recovering from the fever, I decided to do some research on this.
the normal human body temperature averages 37 'c (98.6'F); it is lowest in the morning and rises in the evening. A few people have a 'normal' temperature as much as 0.6'C(1'F) above or below the average. Someone is said to be feverish is his or her temperature rises above its own norm. Fever is a symptom of an underlying problem, usually a sign that the body is fighting infection. It is often accompanied by other symptoms, such as sweating, shivering, thirst, flushed skin, nausea, aching and diarrhoea.
Sweating, the body's response to raised temperature, results in the loss of fluid. So it is important to drink at least 1.7 litres of fluid a day to prevent dehydration. If a feverish person does not feel thirsty, it may be easier for him or her to take a small volume regularly: a 200 ml glass of fruit juice diluted with an equal volume of water at hourly intervals is good way to replace lost fluids.
As well as losing fluids , the body burns energy rapidly during a fever . However , people with fever often lose their appetite, so it may be difficult to persude them to eat; furthermore, when people have diarroea, or are vomiting, it is better that they do not eat at all, in order to give the gut a chance to recover.
Children's temperature can rise rapidly, but a high temperature ( over 38.9'C, 102'F) does not necessarily reflect the severity of an illness . Doctors treat illnesses, not raised temperatures, and parents concerned that their child is ill should , of course, seek medical advice. a feverish child can be cooled with paracetamol, and by sponging his or her limbss with tepid water . In adults, if a fever persists for more than three days or is accompanied by other symptoms such as severe pain, neck stiffness , dislike of light or a purplish rash, consult the doctor for diet constraints.

single star supernova

As stated in the previous post, most irons found in the galaxy come from type 1-A supernova, however, heavier elements like gld , silver and uranium comes from another type of supernova- a single star supernova.
A star must be much bigger than our sun to go supernova. The bigger the star, the faster it burns. When the nuclear reactions in the star speed up. Unlike the double star supernova, the single star supernova creates a lot more elements before they explode. Once they turn hydrogen into helium, helium into carbon and carbon into oxygen, they do not turn into white dwarf stars. Instead, they keep on burning and turn these elements into the heavier elements. And when it eventually explode, the atoms inside the core starts to crush together to a incredible density and it explodes. The elements transform into elements heavier than iron. From iron to cobalt , on and on to gold and uranium. The explosion blast these elements far away in the universe.

term 2 reflection

Sigh********

Again, I got A1 for science. Again, a low A1! Again, happy, yet dissapointed.

I began my revision way before the test this time. However, i still fell on the topic reflection. Perhaps, i was too confident that I will score well for the test. Perhaps, if I had spend more time revising, perhaps.............
No matter what I say now, I cannot change the history. I have made my decision to start studying for next term NOW.

Hope that this term's effort can make next term's test a breeze.........

term 1 reflection

Despite optaining an A1, I realised that it was not good enough.
I still need to improve on my chemical bonding and equation writing as my understanding of these topics are not thorough.
Indeed, I did a lot of revision before the test. However, I only started my revision 2 days before the test. This perhaps is the reason why I feel that I am not working hard enough.
However, compared to last year's result I have improved quite a bit as I scored a B4 for science last year. B4 to A1, it took me very long to achieve this. (I never had an A1 for science last year)
I am not satisfied with my results yet. Trying to work harder for next term's test!

type 1-A supernova

Everything around us are made from supernovae. From our head to our toes, from the land to the sea. All these come from the supernovae.
A single supernova can outshine the entire galaxy , releasing trillion times of the energy released by our Sun. They are so powerful that if one explode in a few light years away, earth would be toast.
Most stars are basically giant nuclear reactors. The reaction fuses hydrogen atoms together, producing helium and energy. When hydrogen runs out, stars keep burning by fusing helium into carbon, then carbon into oxygen. In a normal star, there is a balance between gravity pulling in and pressure pushing out. However, once the star stops generating energy, the pressure goes away and gravity wins. Then the gravity will begin to crush the centre of the star. The star's outer layer will expand rapidly while the the gravity will crush its core to just a millionth of its original size. It is now a dense spot of oxygen and carbon called white dwarf. The gas of the star will disperse but the tiny white dwarf will remain.
As most of the stars come in pairs, when one dies, its white dwarf starts stealing material from the other, slowly sucking the hydrogen and helium from the other star. As it does so, it gets heavier and denser. Inside, carbon and oxygen atoms are about to fuse together. This star is slowly turning into a type 1-A supernova. Eventually the white dwarf sucks so much energy from its companion that it goes into nuclear overload. The oxygen and carbon will fuse and turn into iron and at this oint in time, the white dwarf explodes. The element iron found in our blood and other things on earth mostly comes from this type 1-A supernova.