Fact or Opinion?
Common Sense or Nonsense?
Explanation or Excuse?
Open-minded or Empty-headed?
Just as some foods that taste good might have little nutritional value, or could even be
harmful, ideas sometimes seem emotionally satisfying but have little basis in fact or logic. Such ideas could be
harmful if they become so entrenched as to obscure alternatives that might lead to the truth. Be at least as careful
about what goes into your mind as you are about what goes into your stomach.
Professor Tangent can help you decide with skeptical inquiry, brainteasers, games, logic,
common sense, humor and curriculum suggestions for educators, homeschoolers and students of all ages. Quality thinking
protects you from being deceived by others, and prevents you from deceiving yourself.
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at the left.
Mathematically, a tangent is an angle's sine divided by its cosine. A graph of the tangent function starts at
0, increases to infinity, drops instantly to negative infinity, increases until it returns to 0, then starts all over
again. A straight line touching the rim of a circle at only one point is also a tangent. All four sides of the blue
squares in Professor Tangent's logo are tangents to the inner green circle, a pictorial representation of the
professor's occasional tendency to "go off on a tangent". A "tan gent" is also what the cultured
professor becomes after a few days of lounging on the beach.
The Tangent Function
As the angle (represented by the X axis) approaches 90°, the value represented by the Y axis
approaches infinity. This is called an asymptote. Just past 90°, there is another asymptote in the negative
direction. What happens at exactly 90°? Like the concept of infinity, it's not defined precisely. We can only
really know what happens as we get close - and we can get very close. It's kind of like filling pages with 9s - the
number keeps getting bigger (and closer to infinity), but no amount of paper is sufficient to actually reach infinity.
Learning is a similar process. You can keep gaining expert knowledge (and getting closer to knowing everything that
might be known), but you'll never know everything (and can never be certain that there's nothing left to learn). Okum
prefers the short version: "You don't know what you don't know."
Okum Taylor
A close friend of the professor, Okum Taylor lacks a rigorous academic background, but the professor respects
Okum's abundant common sense, practical analysis and ability to simplify seemingly complex issues.
Who thinks up all this stuff???
Many people. Some of these ideas may be thousands of years old and are probably unattributable. Beyond that,
why be concerned? "This stuff" is either reasonable or it isn't. If it isn't, convince us and we'll change
it. If it is legitimate, blaming it on a particular individual won't make it any truer, and could
diminish the contributions of others who may be unknown. Think of it as
stone soup for the soul.
If I have seen further, it is by standing upon the shoulders of giants. Sir Isaac Newton
Many ideas grow better when transplanted into another mind than in the one where they sprang up. Oliver Wendell Holmes
Learn from the mistakes of others - you can't live long enough to make them all yourself. Martin Vanbee
Attributing quotes can be particularly troublesome and unreliable. Usually, there's no practical way to trace
the ultimate source, or to know what the exact words really were. The professor selects quotes that are interesting,
important, or clever on their own. If nothing else, an attribution means that we wish we could take the credit, but
someone else thought of it first.
Contacting the
or
Questions, comments, suggestions and links are welcome (as are brainteasers, puzzles, games, and your thoughts
on logic, skeptical thinking, etc.) but you may not always get a personal response. You're most likely to get a reply
if you mention what you're ultimately trying to accomplish, or if you have a testable hypothesis. All submissions should be
accompanied by specific permission for the professor to use and distribute it. Reliable information concerning the
source of unattributed quotes, humor or anything else is also welcome.
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