From deep in the jungles of Costa Rica, Fred sets out to hunt down the massive blue marlin that swim offshore.

Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many as 40,000 years ago, officials announced Friday, calling it the biggest such find here in decades.

Blue light glasses may help prevent insomnia by blocking blue light that interferes with sleep. Research is mixed on whether blue light glasses effectively reduce eye strain. To reduce eye strain, ...