How many universes are there? Author Brian Greene explains. Plus: A fracking update, a look at what’s next in Egypt and an interview author Parag Khanna.
The federal government is warning residents in a small Wyoming town with extensive natural gas development not to drink their water, and to use fans and ventilation when showering or washing clothes in order to avoid the risk of an explosion.
In collaboration with ProPublica, Need to Know correspondent John Larson investigates the practice of “fracking,” which some Wyoming residents say is polluting their water.