Forget the concerns about fertility when using a laptop placed directly on your lap, having your lap catch fire is a bit more of a concern.  If you are using a Toshiba laptop right now, quickly flip it over and check if it is on fire, or if the serial number resembles G71Cxxxxxxxx.  If either of those conditions are true, please contact Toshiba customer support on this page, which also has a software utility you can run to see if you are affected by this recall.  According to The Register, some of these batteries may have been sold individually or as repair kit for Satellite, Portégé and Tecra models so you should check; better safe than on fire.

"Toshiba is recalling the battery packs in 39 notebook models over fears they could be prone to catching fire."

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