Donald Trump has callously thrown around accusations of treason aimed toward his political rivals — others think the president's actions are worthy of the charge. Treason is a high bar to prove in the US, but in Ukraine, a presidential treason conviction was announced earlier this year. And it has lessons for American democracy, experts say.

The 1984 gas leak in Bhopal, India destroyed thousands of lives; but in the US, the disaster led to better regulation of industrial hazards.
Iceland has been one of the countries hardest hit by the economic crisis, but it remains a draw for American artists, writers and musicians.
New guidelines for mammograms -- screenings at 50, every 2-3 years -- consistent with many other countries around the world.
Connie Hedegaard, chair of Copenhagen climate summit, says US will loose out if it doesn't take on leadership role.
From politics to revolutions and branding -- the history behind geographic name changes around the world.
Stop motion animation, invented by a Hungarian émigré, is back with the big-budget release of "Fantastic Mr. Fox."
From Gary Oldman and Kate Beckinsale, to Rob Pattinson and Stephen Moyer, the UK exports quality vampires.
Piccolo Teatro Lirico, a small historic theater in Rome, has a new, short twist on a centuries-old art form.
The Venezuelan government has sealed off part of the country to stop H1N1 from devastating the Yanomami Indians.
Men's underwear sales around the world can be an indicator of whether the economy is turning around.