till you die
http://www.freewebarcade.com/help/3d-logic-walkthrough.php
I believe it cannot be solved -- levels 1 through 49 were not that difficult -- there is a logic to follow -- level 50 defies the logic and rules so it is not able to be solved.
There are one 3s orbital, three 3p orbitals, and five 3d sublevels.
After you hit level fifty, the levels keep regenerating into random levels.
I believe there's four levels for every world, so if there is eight worlds, there is thirty-two levels!
As many as my little heart desires
There are 18 electrons in total, and the outer energy levels are the 4s and 3d orbitals. Therefore, there are 2 electrons in the 4s orbital and 4 electrons in the 3d orbital, making a total of 6 electrons in the outer energy levels.
The basic reason is historical - although there were many different types of early logic gates the first series that was really used in large volume was the 54xx/74xx series from Texas Instruments - and they operated on a 5V supply and used nominal 0-5V logic levels.
The use of transmission gates eliminates the undesirable threshold voltage effects which give rise to loss of logic levels in pass transistor logic.
It means that an electronic circuit is designed in such a way that a 1 is represented by a HIGH voltage, and a 0 is represented by a LOW voltage. Also known as active-high. If it's the other way round, it's called active-low, or negative logic.
Intentional Logic has 440 pages.
The Logic of Life has 272 pages.