The Next Big Thing in CAPTCHAs
catchmyfame.com
catchmyfame.com
The photos take up the entire frame with various colors instead of one solid one, so it is not likely for any of them to end up with a mismatch like this.
Naive attack, but it works well in my testing (ran it about 10 times, 100% success rate). If you have PIL installed, just run it through python and it'll grab an image and print whether it succeeded or failed to verify its solution.
(Adds a "Solve" link that moves the image rows into a solved position. Tested in Firefox 3.5.)
The stated problem is: “You have a 100 pound bag of potatoes. 99% of the bag is water weight. You leave the bag in the sun for a few hours. Now you bring it in and it is only 98% water weight, due to evaporation. What is the new total weight of the bag of potatoes?”
The first-reaction answer is that the bag now weighs 98 pounds. But originally the bag contained 1 lb of solid, 99 pounds of water. (Let's assume no other liquids than water). After evaporation, you still have 1 lb of solid, but it's now 2% of the total weight. For 1 pound of solid to equal 2% of total weight, the total weight has to be 50 pounds. That means the bag has only 49 pounds of water remaining. (That seems like a lot of evaporation for just a few hours in the sun.)
Seems to me that it would be 1.01%.
Per the problem statement, the 100-pound bag was initially 99% = 99 pounds of water. The non-water part (which we'll assume for simplicity was non-volatile solids) was therefore 100 pounds - 99 pounds = 1 pound. Solids don't evaporate, so even after evaporation, the 1 pound of solid matter remains. That 1 pound is now 2% = 1/50 of the weight, per above. The total weight after evaporation is therefore 50 pounds.
- Easier to defeat than OCR.
- Only 9 combinations, so random guessing works fine too.
- Visually impaired fail.