"Canadians are not fully informed about these risks and may not be taking appropriate precautions to protect themselves," the report says. It's not that Ottawa hasn't identified toxins. In 2006, the government compiled a list of more than 4,300 toxic substances it was evaluating."

An Australian high voltage site with 200 projects

LC FILTERS DESIGN

Lumped LC Filter Solutions

Scientists say they have developed a quick technique for detecting liquids that could be used as explosives.

"Greetings citizen scientists, budding biohackers, and backyard explorers! We think you'll find the Make: Science Room a fun and useful resource. We hope you'll use it as your DIY science classroom, virtual laboratory, and a place to share your projects, hacks, and laboratory tips with other amateur scientists. Your Make: Science Room host is Robert Bruce Thompson, author of Illustrated Guide to Home Chemistry Experiments: All Lab, No Lecture. (Make: Books, 2008) and Illustrated Guide to Forensics Investigations: Uncover Evidence in Your Home, Lab, or Basement (not yet published). We'll be drawing material from these titles first, but will soon branch out into biology, astrononmy, Earth sciences, and other disciplines."

"Researchers are finding that food miles are far from the whole story when assessing the environmental impact of what we eat. At a conference last month on the economics of food, Chris Foster of Manchester Business School presented some startling conclusions from a review of the evidence. "

In September this year, two research groups independently reported the existence of monopoles - "particles" which carry an overall magnetic charge. But they exist only in the spin ice crystals. These crystals are made up of pyramids of charged atoms, or ions, arranged in such a way that when cooled to exceptionally low temperatures, the materials show tiny, discrete packets of magnetic charge.

A very strange looking cloud.

Building a trebuchet from scratch and finding the best proportions, weights, angles etc by trial and error certainly works ..well, that's how the Grey Co's first machines were done... but if you could model the rock-throwing beasts mathematically then think of the work and possibly wasted effort you could save.

Some very simple counter-weight trebuchet theory.