distances, directions, and heights by laser beam and then sends them to a computer. Before deciding where to dig, we carry a fluxgate gradiometer (a type of magnetometer) over the site to detect tiny variations in the magnetic sensitivity of deposits. The results are downloaded onto an onsite computer to produce a diagram of what is below ground. It picks up quarry ditches cut into the limestone bedrock on either side of our burial mound and even detects walls and other features within the mound itself. Last year, we also used radar sounding to see if we could locate burial chambers within the mound. One day we www.archaeology.org After taking CTscans of Juanita, the frozen Inka girl sacrificed on an Andean mountaintop, Johns HopkinsUniversitypathologists extract tissue samples to determine the 14-year-oldgirl's health at the time of her death some 500years ago. The CTscans revealed that she died froma blow to the head rather than slowlyfreezingto death as was first believed. NationalGeographic Image Collection 51http://www.archaeology.org