also a section of a lung of a soldier who died of the influenza pandemic that killed 50 million people around the world. this is a few of the pathological specimens on display. we are now at an exhibit on forensic verification and the -- forensic identification and the science that is involved in determining a positive scientific examination on missing war dead. we start with the story of colonel charles sharp. colonel sharp was a pilot in vietnam. he was shot down rid his body was not recovered. but in the 1990's, a small piece of bone was found at a crash site. while it might have been colonel sharp's, there is no positive occasion. -- positive identification. but then eventually dna from the bone was matched with dna from love letters that colonel sharp had licked the envelope bob and --lickede envelopes the envelopes of earlier and that dna was a positive match. that helps tell the story about the role dna place today in a modern forensic identification and includes this early thermo cycler used to amplify dna recovered from ancient bone materials. as the exhibit goes on, we talk a