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Motorists inexperienced at driving on ice awoke to light snow , trees sagging with ice and icicle-draped cars - and called in for a day off.For Houston , the state 's largest city , the storm was more inconvenience than natural disaster , as temperatures rose barely above freezing shortly after sunrise.Nevertheless , a Houston city employee was killed early Wednesday when he was hit by a car and knocked over a guardrail as he and a co-worker tried to help an accident victim , said Frank Michel , spokesman for Houston Mayor Bill White . A family of six was asleep in Loughside Drive when the first device exploded shortly after 2.00am , smashing a window . However , this test must also be done shortly after exposure , and it is not a reliable indicator of how much benzene you have been exposed to , because phenol is present in the urine from other sources ( diet , environment ) . Since surplus embryos in fertility clinics are generally deep frozen shortly after conception , this interpretation would remove any ethical barrier to stem cell research using frozen embryos . Losses are reduced if it rains shortly after application , and if application is done as the air temperature is dropping ( such as in the late afternoon ) .