askscience

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The Nand Game (nandgame.com) shows how all logic gates can be built out of NAND gates. Can this be done with any logic gate as a starting point, and if not, what makes NAND (and any other gates with which it's possible, if any) special?	15
What are the current roadblocks to creating practical quantum computers?	10
Has there been any research into the results of 'stranger danger' education? How often does mistrust of strangers last into adulthood as a result? Could such education have damaged society?	1
What do psychologists believe is more common: the kind of internet troll whose online behavior is compensation for problems in their life, or the kind who has no such excuse and just does it to blow off steam?	1
Are there diseases or other medical conditions with cures or treatments that work well but aren't used because they're considered unethical?	1
If the widely-spread Conficker malware's behavior on April 1, 2009 had been as over-the-top malicious as some people had feared (instead of just creating a spam botnet and installing scareware), what's the most damage it could have done?	1
In the Monty Hall Problem, after a door's chosen, the opened unchosen door is always a loser, and the chosen door's win chance is still 1/3. But what if the opened unchosen door is truly random? If it's a winner, the chosen door's win chance becomes 0. But what if it's a loser?	1
Among all known primes, what are more common: primes one less than a multiple of six, or primes one more than a multiple of six? Or are they about equal?	1
Why do we associate higher notes with higher altitudes, descending notes with decreasing altitude etc.?	1
I recently remembered a controversial theory stating that since rich people tend to have kids with rich people and poor with poor, and rich people can afford to be choosier about looks, humans will (if we survive long enough) evolve into a beautiful species and an ugly one. Is this plausible?	1

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