Bill Cosby's trial for sexual assault opens in Pennsylvania with tearful testimony from one of his alleged accusers as prosecutors painted the megastar turned pariah as a sexual predator who established trust with younger women before...

Hunters stand by a tree searching for their prey.

A cheetah looks around.

A yellow eyelash viper flicks its tongue.

Sky News Miscellaneous Events

INTERVIEW: Ellen Page on playing a 'predator' in the film, and her favorite part of the film to shoot at the 'Super' Junket at Los Angeles CA. (Footage by WireImage Video/GettyImages)

SERENGETI, TANZANIA - UNDATED: Wildebeest cross the Mara River on the Serengeti, Tanzania.Thousands of panicking wildebeest rampage across a river bustling with dangerous predators in one of nature's greatest spectacles. The crossing of...

Shot of a Predator on the flight line. (Footage by John Moore/Getty Images) U.S. Air And Marine Predator Drones Launch For Missions Overlooking U.S.-Mexico Border on March 07, 2013 in Sierra Vista, Arizona (Footage by Getty Images)

Pilots in the flight operations center control the Predator from the ground. (Footage by John Moore/Getty Images) U.S. Air And Marine Predator Drones Launch For Missions Overlooking U.S.-Mexico Border on March 07, 2013 in Sierra Vista,...

Pilots in the flight operations center control the Predator from the ground. (Footage by John Moore/Getty Images) U.S. Air And Marine Predator Drones Launch For Missions Overlooking U.S.-Mexico Border on March 07, 2013 in Sierra Vista,...

A U.S. Customs and Border Protection (CBP) Predator drone is prepared for takeoff at the flight operations center at Fort Huachuca in Sierra Vista, Arizona near the Mexican border. (Footage by John Moore/Getty Images) U.S. Air And Marine...

A U.S. Customs and Border Protection (CBP) Predator drone is prepared for takeoff at the flight operations center at Fort Huachuca in Sierra Vista, Arizona near the Mexican border. (Footage by John Moore/Getty Images) U.S. Air And Marine...

A U.S. Customs and Border Protection (CBP) Predator drone is prepared for takeoff at the flight operations center at Fort Huachuca in Sierra Vista, Arizona near the Mexican border. (Footage by John Moore/Getty Images) U.S. Air And Marine...

A U.S. Customs and Border Protection (CBP) Predator drone is prepared for takeoff at the flight operations center at Fort Huachuca in Sierra Vista, Arizona near the Mexican border. (Footage by John Moore/Getty Images) U.S. Air And Marine...

Detail Shot of a screen in the flight operations center where pilots control the Predator from the ground. (Footage by John Moore/Getty Images) U.S. Air And Marine Predator Drones Launch For Missions Overlooking U.S.-Mexico Border on...

Pilots in the flight operations center control the Predator from the ground. (Footage by John Moore/Getty Images) U.S. Air And Marine Predator Drones Launch For Missions Overlooking U.S.-Mexico Border on March 07, 2013 in Sierra Vista,...

A yellow eyelash viper holds its mouth open.

Elephants startle a young lion.

A yellow eyelash viper flicks its tongue and strikes.

A cheetah drinks from a watering hole.

A hunter walks in tall grass in search of his prey.

Growing concerns over antibiotic usage and resistance

The U.N. is focusing its climate stakeholders on expanding marine protected areas, which can effectively keep carbon out of the atmosphere.

Jul.13 -- Sen. Marsha Blackburn, a Tennessee Republican, discusses her concerns about Snap Inc., the privacy issues surrounding social media and the antitrust debate over big tech. She speaks with Bloomberg's Emily Chang on "Bloomberg...