Why not take a break from the fire hose of Twitter and RSS and check out our weekly roundup of essential writing from around the web about technology, culture, media, and the future? Sure, its one more thing you can feel guilty about sitting in your Instapaper queue, but its better than pulling in vain on your Twitter list again. Will Storr reports on the death and radioactive poisoning of Alexander Litvinenko. Matter: Will Storr – How radioactive poison became the assassin’s weapon of choice