Inside the Airbnb-Backed travel startup lyric

April 22 marks Earth Day, and this year's theme is "Planet vs. Plastics". Over the past 60 years, around 7 billion tons of plastic have been produced, according to the UN. But only around 10 percent of it has been recycled. Initiatives are flourishing around the world to tackle the waste crisis, including new technology to improve recycling rates.

Engineers at Columbia University's Creative Machines Lab have developed Emo – a robot capable of mimicking human facial expressions – to “enhance the interactions between humans and robots.” Emma Jehle has more.

We look at reactions to New York's highest court overturning Harvey Weinstein's sex crimes conviction in a major decision that could impact his future appeals. Also: France's highest civil court rules on a case filed by an association claiming ownership of the Louvre's more celebrated painting, the Mona Lisa. Finally, artificial intelligence can accurately predict your political leanings – just by looking at your face!