How Does it Work?

How do volcanic eruptions happen and what causes them? Watch this episode of "How Does it Work?" to learn about the forces behind these powerful blasts.

How are tunnels built under cities and mountains? Watch this episode of "How Does it Work?" to discover the engineering that makes tunnels possible.

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.

How do boats float and travel across water? Watch this episode of "How Does it Work?" to learn what keeps boats moving and afloat.

How does the nitrogen cycle move this element through the air, soil, and living things? Watch this episode of "How Does it Work?" to see how nitrogen supports life on Earth.

How do chatbots understand and respond to your questions online? Watch this episode of "How Does it Work?" to discover the technology behind automated conversations.

How does kinetic energy make things move? Watch this episode of "How Does it Work?" to see how motion transfers energy from one object to another.

How do fitness trackers measure your steps, heart rate, and sleep? Watch this episode of "How Does it Work?" to find out how these devices track your health.

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 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 a skyscraper stand tall and stable above a city? Watch this episode of "How Does it Work?" to learn about the engineering behind these giant buildings.

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.

How do astronauts eat in space and what is their food like? Watch this episode of "How Does it Work?" to see how astronaut meals are prepared and consumed.

How does the eye let you see the world around you? Watch this episode of "How Does it Work?" to find out how your eyes process light and images.

How does a seismograph detect and record earthquakes? Watch this episode of "How Does it Work?" to learn how these instruments track earth's movements.

How does water travel from the ground to the sky and back again? Watch this episode of "How Does it Work?" to discover the steps of the water cycle.

How do hydraulic systems use fluid power to move heavy objects? Watch this episode of "How Does it Work?" to learn what makes hydraulic machines work.

How does a spider spin its web and catch prey? Watch this episode of "How Does it Work?" to discover the secrets of web building.

How does drinking water get cleaned and delivered to your tap? Watch this episode of "How Does it Work?" to see the journey water takes before you drink it.

How does a drone fly and capture images from above? Watch this episode of "How Does it Work?" to explore the technology behind drone flight.

How does a thermal camera show heat that you can't see with your eyes? Watch this episode of "How Does it Work?" to learn how these cameras detect temperature.

How do optical illusions trick your eyes and brain? Watch this episode of "How Does it Work?" to find out what makes these puzzling images work.

How do solar panels turn sunlight into electricity? Watch this episode of "How Does it Work?" to see how energy from the sun powers your devices.

How do X-rays let us see inside the human body? Watch this episode of "How Does it Work?" to discover the science behind this medical imaging tool.