Nature World News: In Western Oregon and Washington, the number of heat waves at night is rising, a new study found. Researchers said that people living in these regions must consider buying a fan or an air conditioner as temperatures might soar in the last week of July.
Night-time heat waves occur when the low temperature of the day falls within one percent of the record temperature for at least three consecutive nights.
In July 2009, a heat wave in Seattle broke temperature records dating back to 1891. This...