Logic
Steven Pinker tests your deductive reasoning
Depending on the content two problems with identical logical overlay can be obvious or difficult.
Communication
Morse Code Encoding Tree reminds of Huffman Code
Morse code is made up of dots and dashes which can be thought of as 1's and 0's. Morse Code is encoded along the lines of a Huffman code and thus one has to wonder if Huffman's paper was inspired by it. Wikipedia: Huffman Coding
Math
Cubic Polynomial with 3 Real Roots
Research Links Wikipedia: Cubic Function For the cubic with three real roots, the roots are the projection on the x-axis of the vertices A, B, and C of an equilateral triangle. The center of the triangle has the same abscissa as the inflection point.
Books
Srinivasa Ramanujan and His NoteBooks
Original Manuscripts Pdf files of the original manuscripts of the Notebooks of S. Ramanujan at the University of Madras are given below. Volume 1 Volume 2 Volume 3 Ramanujan's lost notebook The originals are hard to read An overview of Ramanujan's notebooksI Ramanujan I Ramanujan II
Books
The Lost Book of Archimedes : Documentary on the Lost Manuscript of the Mathematical Genius
The Archimedes palimpsest is a 10th century copy of his work called "The Method". I would like some day to read it. Research Links Wikipedia: Archimedes Palimpsest The Method of Archimedes – Heiberg The recovery project website Books on or by Archimedes Some explanations and videos explaining Archimede's method Read more…
Computing
Vigenère Cipher And Breaking it
It was originally thought to be unbreakable. You use a key such as PASSWORD. Each Letter in your message is encoded by placing PASSWORDPASSWORDPASSWORD THISISATESTOFTHECODE Each letter is encoded by using choosing the corresponding row from the key letter above your message letter. The obvious failing is that after a bit Read more…