Since the begining of this year the standart ISBN has now 13 numbers instead of 10 so, I did some functions for validating the ISBN-10 and EAN (works for ISBN-13) with PHP, maybe it’s useful for someone.
Continue reading ‘ISBN-10 and ISBN-13 (EAN) validation with PHP’
Hello there, I’m finally home! I’m kinda tired from the train trip but hopefully my bed will give me my deserved rest tonight…

Continue reading ‘I’m back from Lisbon!’
I’ve scanned this nice article about Jimbo Wales (the founder of Wikipedia) I read on ExecutiveDigest today (sorry, only Portuguese).


Continue reading ‘Why is Jimbo Wales smiling?’
I was looking up at the ceiling eyes wide open, seeing greens and purples, swirling and condensing to black. - Elissa
I’m at this moment trying I-Doser with the LSD dose, this is amazing: at 78% I hear cruise ships playing their horns or a cat crying out loud, I can’t really figure it out.

Continue reading ‘I-Doser - Virtual Drug Doses’
Prime numbers have always been a central point of mathematical studies as they yield (at least for now) lots of stuff that we don’t understand (like factoring and it’s distribution among natural numbers - read the Wikipedia link bellow if you want to find out more). Prime numbers also play a big role paper in our world, as strange as it seems, our unability to fully understand primes is the basis of our digital security as we know it today. Finding new prime numbers nowadays is a task that no longer can be done by humans (as far as I’m aware of) and a computer takes at least a couple of days to find a new one.
Continue reading ‘Mersenne Primes - Discovering Mammoth Primes’
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