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"To mark last month's World Teachers' Day (sponsored by UNESCO , the United Nations Educational, Scientific and Cultural Organization), photographers from Reuters took pictures around the world of educators with their students in a telling exhibit of the very different circumstances under which children attend school. Here are 15 pictures taken by Reuters photographers, revealing the spectrum of "classrooms" - from those with literally no resources to those well-stocked and housed."

"Contents:Notebook of Leonardo da Vinci ('The Codex Arundel'). A collection of papers written in Italian by Leonardo da Vinci (b. 1452, d. 1519), in his characteristic left-handed mirror-writing (reading from right to left), including diagrams, drawings and brief texts, covering a broad range of topics in science and art, as well as personal notes. The core of the notebook is a collection of materials that Leonardo describes as 'a collection without order, drawn from many papers, which I have copied here, hoping to arrange them later each in its place according to the subjects of which they treat' (f. 1r), a collection he began in the house of Piero di Braccio Martelli in Florence, in 1508. To this notebook has subsequently been added a number of other loose papers containing writing and diagrams produced by Leonardo throughout his career. Decoration: Numerous diagrams. "

"In this Instructable, I'm going to be showing you how to build your own crack the code game in which you use a rotary encoder dial to guess the randomly generated code to the safe. There are 8 LEDs on the front of the safe to tell you how many of the digits you've guessed are correct and how many are in the right place as well. The safe is initially open, allowing you to put something into the inside compartment. The Arduino and battery are housed in a separate compartment in the back. You then push the dial to lock the safe, which is done using a servo on the inside of the door. You then need to input the code by turning the dial to select the digits and pushing the dial to confirm each digit. After your fourth digit is chosen, the safe displays how many of your digits are correct and how many of them are in the correct place using the red and green LEDs on the door. "

"Los diseñadores en del estudio i-beam Design crearon el proyecto de casa con palets inspirados en un hecho simple pero increíble: el 84% de los refugiados del mundo podrían tener una pequeña casa como la que ellos han diseñado con los palets que se desechan solo en Estados Unidos. Así 33 millones los refugiados podían vivir en una casa hecha por ellos mismos. Eso son un montón de viviendas para un montón de gente con grandes necesidades. Lo que hace que su diseño sea tan brillante es que prácticamente cualquier persona puede construirse una de forma muy barata y en menos de un día. Incluso podrías reservar 10 palets para hacerle una piscina."