Jakow Trachtenberg - Wikipedia Jakow Trachtenberg (17 June 1888 – 1953) was a Russian mathematician who developed the mental calculation techniques called the Trachtenberg system. He was born in Odessa, in the Russian Empire (today Ukraine). He graduated with highest honors from the Mining Engineering Institute in St. Petersburg and later worked as an engineer in the Obukhov arms factory.
Wikimedia Commons Cancel Edit Delete Preview revert Text of the note (may include Wiki markup) Could not save your note (edit conflict or other problem). it — Support Free eBooks Andreas M. Antonopoulos Mastering Bitcoin is essential reading for everyone interested in learning about bitcoin basics, the technical operation of bitcoin, or if you're building the next great bitcoin killer app or business. From using a bitcoin wallet to buy a cup of coffee, to running a bitcoin marketplace with hundreds of thousands of transactions, or collaboratively building new financial innovations that will transform our understanding of currency and credit, this book will help you engineer money. You're about to unlock the API to a new economy.
10 Best, Shockingly Good Apps for ESL Teachers As technology continues to get more and more popular, classroom attention spans are getting shorter and shorter. Times are changing quickly and ESL teachers have to hop on board before the train leaves. Keeping the attention of a student while you’re teaching may seem difficult at times, but fear not! Help is on the way! By working with technology, using some of these apps will effectively help you add a new dimension to your teaching. It’ll also give students a break from the traditional classroom, all while still reinforcing the skills they are learning.
10 Illusionary Flowers! Humans see faces in inanimate objects all the time, but these flowers take it to the next level… Nature is beautifully mind blowing! The Funny “Monkey Face Orchid” (Dracula Simia) S.F. interior designer Robert Hutchinson dies Zahid Sardar, Chronicle Design Editor Published 4:00 am, Wednesday, December 24, 2008 Photo: Family Photo, Family Photo obit photo of Robert Reynaud Hutchinson, a San Francisco interior designer who contributed to the California Style established by contemporary Michael Taylor, has died of lung cancer.Known as Hutch to his friends, Mr. Hutchinson was 71 when he died on Dec. 10 in San Francisco.
ClipArt ETC: Free Educational Illustrations for Classroom Use Alphabets The Alphabets ClipArt collection offers 1,193 illustrations arranged in 43 galleries including decorative letters and numerals, complete alphabet sets, and several sign language systems. If you are looking… Wikimedia Commons / Vidéos Cancel Edit Delete Preview revert Text of the note (may include Wiki markup) Could not save your note (edit conflict or other problem). Please copy the text in the edit box below and insert it manually by editing this page. Upon submitting the note will be published multi-licensed under the terms of the CC-BY-SA-3.0 license and of the GFDL, versions 1.2, 1.3, or any later version. 5 Best Apps for English Language Learners - Educational App Store Teachers Find curriculum aligned apps to use in the classroom Start your free trial Parents Find teacher recommended apps for your child Start your free trial