"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Stay sharp and learn something new every day or stock up on knowledge for the next 105 days with these ...

This cat was born looking permanently unimpressed. Thanks to some wild fur markings, this cat appears to have thick eyebrows ...

Life aboard a nuclear submarine is a strange mix of advanced technology and extreme confinement. Crews can stay submerged for months because they generate their own oxygen through electrolysis and ...