LARISSA: “Now if you look at that bottom picture on your pages, you’ll see that you can measure the length and the width of that spatter droplet, right? You can actually calculate the angle at which that blood hit your surface.”
For this workshop, Larissa used red paint to show how different murder weapons can leave different patterns of blood. But she says in a real lab, experts would use pig blood to conduct their tests. Pig blood is very close in thickness to human blood. But it is safer for the scientists to use. She also shows how the chemical Luminol can reveal hidden blood stains that the eye alone cannot see.
This workshop shows that it takes a deep understanding of science to lead a crime scene investigation. And, the job requires careful attention to detail, because even the smallest observation can lead to solving a crime.
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STEVE EMBER: This program was written and produced by Dana Demange. I’m Steve Ember.
BARBARA KLEIN: And I’m Barbara Klein. Transcripts, MP3s and podcasts of our programs are at voaspecialenglish.com. You can also post comments on our website and on our Facebook page at VOA Learning English. Join us again next week for EXPLORATIONS in VOA Special English..
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25