Rapamycin also is being studied for its impact on the normal aging process.

WSJ: Progeria Drug Study Helps in Search for Clues on Aging

In addition to taking normal images of the impact in the visible spectrum, the HRI provides an infrared "fingerprint" of the material from inside the comet's nucleus.

BBC: Q&A: Deep Impact comet mission

Russell, whom her lawyer Amato DeLuca describes as "very distraught, " might be dealing with the psychological impact of realizing her life with Tsarnaev was not normal.

CNN: How could the Boston suspect's wife not know?