by Khan Academy
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Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!
|1||VideoPath Counting Brain Teaser||--||8/21/2010||Free||View In iTunes|
|2||VideoLight Bulb Switching Brain Teaser||--||8/21/2010||Free||View In iTunes|
|3||Video3-D Path Counting Brain Teaser||--||8/21/2010||Free||View In iTunes|
|4||VideoAlternate Solution to Ratio Problem (HD Version)||--||8/22/2010||Free||View In iTunes|
|5||VideoIntroduction to Waves||--||8/22/2010||Free||View In iTunes|
These videos are extremely helpful In understanding complex ideas.
Re: Very un-rigorous
**Also potential spoiler alert**
The simple explaination that all factors are paired in numbers that are perfect squares is a simple language equivalent to the rigorous proof. These are meant to give a simple explaination to what appear to be complex problems, and do a very good job of that. The explainations of all the problems are complete but not frivolous.