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Here's a quick look at some of Nightly News' most popular stories this week, including the cost of the search for the missing Malaysia Airlines flight.

Missing Plane Search Costs Rise

It’s been nearly two months since Missing Malaysia Airlines Flight 370 disappeared. The cost so far? An estimated $100 million. Now that aerial search efforts have been suspended, the hunt for the 777 is taking place on the ocean floor.

Deadly Virus Arrives in U.S.

Experts have said that it was only a matter of time before Middle East Respiratory Syndrome (MERS) arrived in the U.S. On Friday, that day finally came. The Centers for Disease Control and Prevention announced a healthcare worker is being kept isolated in an Indiana hospital after being diagnosed with the virus, which has killed 93 people since it was identified in 2012.

Find Out Which Cities Are the Cleanest

In their 2014 State of the Air report, the American Lung Association evaluated cities across the U.S. and found only four had zero levels of particles or ozone during the years 2010-2012. To see detailed information about your state, visit their interactive map.

Is Your Dog Smarter Than You Think?

All breeds are welcome at Yale University’s Canine Cognition Center where a psychologist is attempting to figure out what dogs know about the world. Find out what their research has discovered so far.