StumbleUpon top 5 rated websites: Secret knock detecting lock, best photoshop tutorials

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A look at this week's top-rated websites from StumbleUpon, recorded on November 6.

This week's selection includes a website that shows you how a secret knock-detecting lock works, a website that shows how clever dolphins are, a website featuring an article about beauty and perception, a website showing how to make a caramel Apple Cheesecake Pie and a website that hosts the best Photoshop tutorials for July 2009.

1. Made by Steve Hoefer
http://grathio.com/

2. Deep thinkers | Science | The Guardian
http://www.guardian.co.uk/science/2003/jul/03/research.science/print

3. Perception & Bits Of Wisdom
http://bitsofwisdom.org/2009/10/21/interesting/perception/

4. Caramel Apple Cheesecake Pie & Annie's Eats
http://annies-eats.com/2009/10/26/caramel-apple-cheescake-pie/

5. Tutorial Magazine - 32 Best Photoshop Tutorials of July...
http://www.tutorialmagazine.com/32-best-photoshop-tutorials-of-july-2009