Sunday, December 11, 2011

More illusions

 old or young woman? 
Is this woman old...or young?
这是一位老妇人还是一位少女?


Moving circles

Focus on the dot in the center,
and move your head forwards and backwards.
What happens?
把你的注意力放在中间的黑点,
然后向前再向后移动。
你看到了什么?



looking up, or looking down
Looking up, or looking down?
往上看,还是往下望?

Wednesday, November 23, 2011

Is coral an animal or a plant?

      
          Corals look like plants, and they don't move around like a lot of animals, but they are animals. What we see as branches actually are whole colonies of coral animals. Each animal, called a polyp, has a hard skeleton and a soft body. This is attached to rock, or to the skeletons of dead polyps. What we sometimes see as flowers actually are the tentacles with which they capture food from the water. One of the main differences between plants and animals is that plants make their own food, whereas animals must eat plants or other animals.Publish Post

Monday, November 21, 2011

Illusion

What are illusions? Illusions trick us into perceiving something differently than it actually exists, so what we see does not correspond to physical reality. Hence, the word illusion comes from the Latin verb illudere meaning, "to mock." In addition, some illusions show us one thing in a picture, while someone else sees something entirely different in the same picture.

Research scientists must be sure that the results of their work are not "illusory" in nature. They need to accurately report what "is," rather than their general "impression" of "what is." So, many times a scientist will repeat an experiment many times, or in different laboratories, to ensure that their results were valid. Science is only "good science" when anyone can repeat the experiment and get the same results.


 The following pictures are NOT animated.



Your eyes are making them move. To test this, stare at one spot in each picture for a few seconds and everything will stop moving; OR look at the black center of each circle in the first picture, and it will stop moving; but when you move your eyes to the next black center, the previous one will move after you take your eyes away from it.

From http://kids.niehs.nih.gov/games/illusions/index.htm

Sunday, November 20, 2011

What is science?

      The word science comes from the Latin "scientia," meaning knowledge.
      How do we define science? According to Webster's New Collegiate Dictionary, the definition of science is "knowledge attained through study or practice," or "knowledge covering general truths of the operation of general laws, esp. as obtained and tested through scientific method [and] concerned with the physical world." 
      What does that really mean? Science refers to a system of acquiring knowledge. This system uses observation and experimentation to describe and explain natural phenomena. The term science also refers to the organized body of knowledge people have gained using that system. Less formally, the word science often describes any systematic field of study or the knowledge gained from it. 
      What is the purpose of science? Perhaps the most general description is that the purpose of science is to produce useful models of reality. 
      Most scientific investigations use some form of the scientific method. You can find out more about the scientific method here. 
      Science as defined above is sometimes called pure science to differentiate it from applied science, which is the application of research to human needs. Fields of science are commonly classified along two major lines:
   - Natural sciences, the study of the natural world, and
   - Social sciences, the systematic study of human behavior and society.


From http://www.sciencemadesimple.com/science-definition.html