I've noticed that a lot of my tutoring students have been taught to cross multiply when dividing fractions, whereas I was taught to multiply by the reciprocal. OK, you may think, they both wind up getting you the right answer, so what? I guess it doesn't matter if your only goal is to pass the next quiz. What you are forgetting is the power of the commutative and associative properties of multiplication.
The Sky of Earth is a panable, zoomable image of the entire sky, stitched together from 1200 photos taken with a Nikon D3 digital camera. The pictures were taken in Chile, France, and the Canary Islands.
The Beagle Project will reconstruct Darwin’s 5-year long voyage on the HMS Beagle in the course of one year, and make an attempt to assess where the world stands today in light of Darwin’s evolution theory. In addition to the website, you can follow it on Flickr, Twitter, Facebook and YouTube.
15-year-old Javier Fernandez-Han won this years Inhabit's Invent Your World Challenge and scored a $20,000 scolarship with his algea-powered system that produces food and fuel, treats waste and captures carbon dioxide.
Quantum to Cosmos festival is being held at the Perimiter Institute (and online) Oct 15-25, 2009. Admission (as well as school trips) are free but registration is required.
