More than 1,300 people in South Korea are under mandatory quarantine as health officials scramble to contain the largest outbreak of Middle East respiratory syndrome, or MERS, outside the Arabian Peninsula. So far, at least 30 people in South Korea have contracted the virus, which has no known vaccine or cure. Two of them have died since the outbreak began May 20.
Many investigators say Positive Train Control (PTC), an automated safety system, could have prevented last month's Amtrak train derailment. Amtrak officials have said they will have PTC installed throughout the northeast corridor by the end of this year, which is the deadline mandated by Congress.
But the vast majority of other commuter railroad systems, which provided nearly 500 million rides in 2014, won't be able to fully implement positive train control for several more years.
It's a problem in a taxi economy if people don't like getting into cabs that are driven by strangers. A cab driver is a stranger almost by definition. But in the high-crime city of Nairobi, Kenya, people prefer to call up drivers they know or who their friends recommend.
An American named Jason Eisen spent years in Nairobi as a consultant until he had his big idea. He built an app that doesn't just tell you which taxis are close by, like Uber does. It also assigns the driver a trust score, by scouring riders' contacts and social media.
Imagine that you're a judge, and you're asked to decide the case brought by Mary and Dave Wildman.
Back in 1997, Mary took the couple's 1-year-old son, Nicholas, to the doctor for the combination-vaccine against measles, mumps and rubella. Right after the MMR shot, Mary says, Nicholas started crying uncontrollably.
"This was unbelievable screaming," she says.
Mary and her mom started driving Nicholas back to their home in Evans City, Pa.