Majority may follow the rule. There may be a few exceptions. Exceptions does not disprove the rule. But prove it strongly.
1. All living beings follow a life cycle. They born, grow, multiply, live and die. But virus never dies. It always spring back to life in watery environment.
2. Normally insects eat plants. We use pesticide to kill them. But there are plants which capture and eat insects.
3. All shapes have two sides. That is, inner and outer surface.
Take a ribbon of paper. Give it to a half twist. Paste the ends together. It is mobious strip and it has only one side.
4. Normally we deal with whole numbers in our daily life. 50000 rupees of salary, cost of 320 dollars, height of 172 cm.
But nature does not deal with such sharp numbers. The mathematical constants pi = 3.14.. and e= 2.71.. are irrational numbers. That is, they are never ending numbers.
5. Basic physical quantities mass, length and time always remains constant as for as our experience goes.
But Einstein's theory of relativity says: when things moves at the speed of light, the basic quantities begins to change.
6. We experience 12 hours day and night cycle. But at the poles of the earth, it is 6 month duration due to tilting of the earth.
7. By mixing the three primary colours red, green, blue in different proportions, we can produce all the millions of colours including white. But black is not a colour. It is simply absence of light.
8. All the mathematical operations have reverse operations.
example: 4^2 = 16
root of 16 = 4
But modular arithmetic is the one way operation.
14 MOD 6 = 2
Divide the 14 by 6 and get the reminder. Hence it is used in cryptography.
9. All liquids {like oils} are quickly heated up. But water requires lot of heat to get heated up. That is why, well water remains cold even in summer.
10. We know the properties of metals. But we also know mercury is a metal and it is an exception. So do not put off by exceptions. Rules will always prevail.
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