�y��vlog

It took 18 months to build the first M.R.I., originally known as a nuclear magnetic resonance scanner, or N.M.R.

Using a magnetic resonance scanner, a noninvasive instrument that can peer deeply inside the body, the scientists measured the amount of fat in each bird before and after the 2-hour flight test—a proxy for how much energy the birds spent.

In January, officials from the cycling union with a newly developed magnetic resonance scanner attached to a tablet computer found an anomaly in a bike used by Van den Driessche at the World Cyclocross Championships in her native Belgium.