The unusually high October heat wreaked havoc on runners at the Chicago marathon today. Three hundred marathoners were treated for heat-related conditions and tragically, one runner collapsed and died during the race. Temperatures soared to an unnatural 88 degrees with oppressive humidity, and four hours into the marathon, race organizers called it off.

Fall is usually a great time for outdoor exercise with its cool crisp days. But until someone tells the weather that autumn has officially arrived, it might as well be summer outside. Be careful out there.

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