I guess things get swallowed all the time, but this tale (from a hospital case study in Devon, in Britain) tells us something extraordinary about felt-tip pens. (If you look at this woman's stomach, there's a pen in there near the top.)
It's called "An incidental ﬁnding of a gastric foreign body 25 years after ingestion," by Oliver Richard Waters, Tawﬁque Daneshmend, Tarek Shirazi, in BMJ Case Reports from 2011.
Here's the full report:
As the Summer Olympic Games get underway today in London, researchers at the National Center for Atmospheric Research in Boulder have been looking back to the last games. The effort to clear the skies in Beijing was also a perfect experiment for climate scientists.