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This week “Big Bertha,” a 52-foot-wide tunneling machine digging under Seattle, was halted by a buried locomotive or maybe even a UFO, and Canadian college students invented ‘alcohockey,’ the air hockey equivalent of beer pong. Also, neither Sprite nor Viagra will stiffen a drooping Christmas tree, but researchers found that 1-in-200 new moms reported having virgin births. And water treatment plant workers in England recorded “Jingle Smells” to warn against flushing clog-inducing materials. Is “Big Bertha” choking on a decades-old English hairball?