 Curiosity's project scientist Ashwin Vasavada said, quote, it shouldn't be there. So now we have to explain it. Michael Toscano, WTOP News. Feeling lonely? A new Gallup poll finds one in five people worldwide say they feel lonely a lot. Medical research finds the toll of loneliness isn't just your emotional health. There's no set criteria for how to diagnose loneliness, unlike conditions like depression or