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We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).

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Comment: Perception of Colour before a Light or Dark Bkgrnd (Score 1) 412

by johnrpenner (#49154235) Attached to: Is That Dress White and Gold Or Blue and Black?

GOETHE explained this through the effect of turbidity on the perception of colour.

Light shining through a darker medium yields yellow; whereas an illuminated turbid medium before a dark background yields blue.

Check out: Light Darkness and Colours @time: 23:30 on youtube:
https://www.youtube.com/watch?...

Comment: Bicycles (Score 3, Insightful) 481

by johnrpenner (#48986339) Attached to: DOT Warns of Dystopian Future For Transportation

Infrastructure for Bikes costs a lot less to construct than infrastructure for cars.

Instead of designing infrastructure that assumes cars — design for bicycles — then there is no more oil crisis, people live longer and happier.

I commuted in a car every day for over 7 years — and going 113km x 2 = 226km day — and three hours a day wasted sitting stuck in traffic.
Sold the car, bought a bike and moved in to town — ten years later — still one of the best decisions of ever made.

A 10 year cyclist in from Toronto.

Bicycles are the key to a sustainable future.

Comment: Coils and Relays (Score 1) 175

by johnrpenner (#48943851) Attached to: Ask Slashdot: How Do I Engage 5th-8th Graders In Computing?

start simple — stroking a nail with a magnet to magnetize it; coiling a wires; then show them a relay.. it works by the principle they themselves have done by coiling wire. then build the four basic logic gates: AND, OR, NAND, NOR.. that will already take a long time. have them write-up the truth tables by toggling switches and getting the results.

then play chess with them — this will better prepare them than anything to thing clearly and logically independent of language semantics which will soon be obsolete.

2cents
j

Comment: its a gift (Score 1) 610

when the ipod came out, apple paid the artists to provide about 300 free songs for users for free - it was a gift - it was like them paying to give us a free mix tape. i found some good tunes on there, and deleted the rest. thx apple.

again, instead of paying for this music, apple is paying (or in cahoots depending on yr pov) for a gift of music that they believe to be good. if you like u2 - its a gift. if you dont, it is easy to delete - you wont even see it unless you go digging for it.

thanks apple.
2cents from toronto
jp

The number of UNIX installations has grown to 10, with more expected. -- The Unix Programmer's Manual, 2nd Edition, June 1972

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