Learn One Thing A Day

The birthday problem (or birthday paradox) refers to the probability that, in a group of N people, there is at least one pair of people having the same birthday. Surprisingly, you need just 23 people to have more than 50% chances to find at least a pair! Yes, only 23! Not, as you could think, 183! There are a short and a long versions of this post. The short one ( aka what you have to remember to impress your friends ) is: In a room with 23 people there are more than 50% chances (50.73% to be precise) to have a at least a couple sharing their birthday.  With 50 people, the probability is 97.04 % and with 80 people we arrive to 99.99% changes to find such  a couple! How is that possible? The rest of the post (the long version) proves the previous numbers. First of all, we have to make some basic assumptions: We have no twins in the room.  No one is born on February, 29th! (we do not consider leap years) Every day is as good as all the others.   In ...

Last update  April, 8th, 2018 After the post about ebooks , I have thought you may be interested on academic papers too and here I am! :) THANKS for your contributions to this post! On the subject education, there is also a new post about the free university courses you can attend online, for free!!! Anyway, if you are a PhD student or a researcher you need to download and study other people's scientific works. For most journals (the most important ones) your institution should have already a subscription. However you'll probably have already experienced that sometimes, you need a paper you cannot download through your institution, pretty annoying eh? So... how can you solve this problem? Where can you download research papers for free? Where to find free scientific journal articles? How to get that f*ck*ng full-text pdf? Are there alternatives to sci-hub ? Yes, just read below! By the way, is sci-hub down? NO, once again, just read below! I will...