Three startup companies led by prominent scientists are working on new technologies to remove carbon dioxide (CO2) from the atmosphere. The scientific community is skeptical, but these entrepreneurs believe removing CO2 can eventually be profitable and help cool the planet.
Even as Tehran signals an interest in nuclear talks, many experts have already envisioned what the world would look like if the country got nuclear weapons. It wouldn't be as dire as many fear, but it would unleash new uncertainties - and perhaps a regional arms race.
Eudora Welty's love for flowers is explored in a new book.