Spiders on caffeine

Niels — Mon, 12 Oct 2009 11:22:31 +0000

You may have seen these images before, but I think they are much more interesting with a bit of explanation of the drugs.

Normal

This is a typical spider web. This is the goal, what you should compare the other images with.

Marijuana

This spider was given marijuana (or “hash”) before making the web. Marijuana makes you slow and makes it hard to concentrate. The spider started just fine, but then it got lazy.

Benzedrine

Benzedrine made this spider active. So active, it forgot to plan anything.

Chloral Hydrate

Chloral hydrate is (among other things) a sedative. This poor spider started nicely, and probably fell asleep.

Caffeine

This is the interesting part. This is what happens when you get too much caffeine. No planning, no system, worthless. Like the sedated spider, it never got to the part with the spirals.

Now let me ask all you software developers like me out there: Do you really want to create software, with large amounts of caffeine in your body?

And everybody else: Do you want to use software created like this?

This experiment was invented in 1948, but these images are from a similar experiment performed by NASA in 1995.

Source: Wikipedia - Effect of psychoactive drugs on animals

And by the way:

In large amounts, and especially over extended periods of time, caffeine can lead to a condition known as caffeinism. Caffeinism usually combines caffeine dependency with a wide range of unpleasant physical and mental conditions including nervousness, irritability, anxiety, tremulousness, muscle twitching (hyperreflexia), insomnia, headaches, respiratory alkalosis, and heart palpitations.

Wikipedia – Caffeine

0,999… = 1

Niels — Sun, 29 Mar 2009 20:53:48 +0000

De fleste har svært ved at tro på, at 0,999… er lig med én. Og det var et nul, et komma og uendeligt mange ni-taller. Hvis er er rigtigt mange ni-taller, så er det cirka én. Men hvis der er uendeligt mange ni-taller, giver det præcist én.

Her er beviset, som fik mig overbevist (brøk-beviset):

0,333… = 1/3

0,666… = 2/3

0,999… = 3/3 = 1

Men dette bevis er baseret på, at nul-komma-uendelig-mange-tre-taller er lig med 1/3. Her er et forsøg mere (ciffer-manipulation-beviset):

x = 0,999…

10x = 9,999…

10x – x = 9,999… – 0,999…

9x = 9

x = 1

0,999… = 1

Hvis ikke du er overbevist, så prøv at finde fejlen i beviset. ;-)

Nå, men det korte af det lange er: Uanset om man tror på det, er det korrekt. De professionelle matematikere er enige, og der er i øvrigt mange flere beviser på Wikipedia.

Det sjove for mig, er folks reaktioner på min påstand. Jeg har observeret 4 forskellige:

Er enig
Giver mig ret, efter at have set et bevis eller to
Tror på mig uden at forstå det
Nægter at tro på det, trods beviser og at alle professionelle matematikere er enige om at det er sandt

Hvilken type er du? ;-)

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Spiders on caffeine

0,999… = 1