(via thephysicsteacher)
Web and mobile phone users willingly share personal data in exchange for free stuff, but not everyone is ready to throw in the towel on privacy

With all of the mobile apps, Web sites and free services clamoring for your personal data, whereabouts and preferences, it might seem as though privacy is at death’s door. Not so. Several projects underway aim to provide virtual lockboxes or screening technologies that can help people to reassert control over their digital lives. In general, privacyenhancing approaches to online data sharing require any company, app developer or government agency that wants to know more about you to ask permission for access to specific information. The rest of your data stay locked away. Services such as Britain’s Mydex offer the ability to store, manage and share personal information in an encrypted central repository called a data store, which only the person who creates the store can fully access. Anyone wanting information contained within that personal data store—an insurance company or marketer, for example—must connect to Mydex’s network and agree to terms of use created by the person owning the data before Mydex will release it. Personal, based in Washington, D.C., offers a similar “data vault” service.
Prime numbers are like atoms. They are the building blocks of all integers. Every integer is either itself a prime or the product of primes. For example, 11 is a prime; 12 is the product of the primes 2, 2, and 3; 13 is a prime; 14 is the product of the primes 2 and 7; 15 is the product of the primes 3 and 5; and so on. Some 2,300 years ago, in proposition 20 of Book IX of his Elements, Euclid gave a proof “straight from the book” that the supply of primes is inexhaustible.
Assume, said Euclid, that there is a finite number of primes. Then one of them, call it P, will be the largest. Now consider the number Q, larger than P, that is equal to the product of the consecutive whole numbers from 2 to P plus the number 1. In other words, Q = (2 x 3 x 4 … x P) + 1.
From the form of the number Q, it is obvious that no integer from 2 to P divides evenly into it; each division would leave a remainder of 1. If Q is not prime, it must be evenly divisible by some prime larger than P. On the other hand, if Q is prime, Q itself is a prime larger than P.
Either possibility implies the existence of a prime larger than the assumed largest prime P. This means, of course, that the concept of “the largest prime” is a fiction. But if there’s no such beast, the number of primes must be infinite. “Euclid alone,” wrote Edna St. Vincent Millay, “has looked upon Beauty bare.”
Paul Hoffman (and Euclid) in The Man Who Loved Only Numbers: The Story of Paul Erdős and the Search for Mathematical Truth.
if you don’t think this is the coolest fucking thing idek what to say
(via deflect)
(via allofmymaths)
Dysfunction in dopamine signaling profoundly changes the activity level of about 2,000 genes in the brain’s prefrontal cortex and may be an underlying cause of certain complex neuropsychiatric disorders, such as schizophrenia, according to UC Irvine scientists.
This epigenetic alteration of gene…
Who said it?
1) “We’re going to take things away from you on behalf of the common good.”
A. Karl Marx
B. Adolph Hitler
C. Joseph Stalin
D. Barack Obama
E. None of the above
2) “It’s time for a new beginning, for an end to government of the few, by
the few, and for the few……and to replace it with shared responsibility,
for shared prosperity.”
A. Lenin
B. Mussolini
C. Idi Amin
D. Barack Obama
E. None of the above
3) “(We)…..can’t just let business as usual go on, and that means
something has to be taken away from some people.”
A. Nikita Khrushev
B. Josef Goebbels
C. Boris Yeltsin
D. Barack Obama
E. None of the above
4) “We have to build a political consensus and that requires people to give
up a little bit of their own … in order to create this common ground.”
A. Mao Tse Dung
B. Hugo Chavez
C. Kim Jong Il
D. Barack Obama
E. None of the above
5) “I certainly think the freemarket has failed.”
A. Karl Marx
B. Lenin
C. Molotov
D. Barack Obama
E. None of the above
6) “I think it’s time to send a clear message to what has become the most
profitable sector in (the) entire economy that they are being watched.”
A. Pinochet
B. Milosevic
C. Saddam Hussein
D. Barack Obama
E. None of the above
Scroll down for the answers
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Answers
(1) E. None of the above. Statement was made by Hillary Clinton – 6/29/2004
(2) E. None of the above. Statement was made by Hillary Clinton – 5/29/2007
(3) E. None of the above. Statement was made by Hillary Clinton – 6/4/2007
(4) E. None of the above. Statement was made by Hillary Clinton – 6/4/2007
(5) E. None of the above. Statement was made by Hillary Clinton – 6/4/2007
(6) E. None of the above. Statement was made by Hillary Clinton – 9/2/2005