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.
For faster browsing, try the
"popups" selection from the menu 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. If your submission might interest others, the
message board could be more appropriate
than e-mail. Check back occasionally to see if your question gets answered on
the website. 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. Be sure
to check out our message board for
comments and contributions from others.
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