What's the risk of bird flu spilling over to larger human populations?
Despite the continued spread of the avian flu, the WHO says the overall pandemic risk has "not significantly changed in comparison to previous years."
LEARN MORELeading health agencies say the recently emerging Marburg virus can have an over 50% fatality rate.
An aging infrastructure in the U.S. has many deaf or hearing impaired Americans in danger as 911 text services are still not available in many areas.
Several African leaders noted their continent's rainforests helped gobble up excess carbon dioxide in the air from other countries.
In a speech Friday, United Nations Secretary-General Antonio Guterres called for a permanent end to the use of fossil fuels.
40% of engagements take place between Thanksgiving and Valentine's Day, according to industry experts.
CBP officials say the Tucson area, including Nogales, is already seeing the highest number of migrants coming into the country.
25 million U.S. students use diesel-powered school buses daily, prompting debates on cleaner alternatives.