Experiments in Germany tested 22 flavonoids on human lung cells infected with the H5N1 influenza A virus.

WSJ: Sleep's Surprising Effects on Hunger

In addition to testing the system to detect fingerprints, the research team did a series of experiments in which they tested the same fingerprint on the same surface every day for 14 days.

FORBES: Can Forensic Scientists Tell How Old A Fingerprint Is?