Live stream preview
How does a lie detector test if someone is telling the truth? Watch this episode of "How Does it Work?" to explore the science behind polygraph tests.
Up Next in How Does it Work?
-
How Does it Work? - Irrigation
How does irrigation bring water to crops and fields? Watch this episode of "How Does it Work?" to learn how irrigation systems support farming.
-
How Does it Work? - Artificial Limb
How does an artificial limb help people move and live more easily? Watch this episode of "How Does it Work?" to see the technology behind prosthetic limbs.
-
How Does it Work? - Space Suit
How does a space suit protect astronauts outside the spacecraft? Watch this episode of "How Does it Work?" to discover what keeps astronauts safe in space.
