Transportation

• Airbags: How can an instant explosion save your life?
• Airplanes: Why can a plane fly upside down?
• Bicycles: Why is it so hard to fall off a bike?
• Bicycle helmets: Why does a helmet have a hard case and a soft middle?
• Brakes: Why do brakes get so hot?
• Car engines: How do they convert liquid fuel into a trip to the mall?
• Car history: How did modern cars evolve from steam engines?
• Catalytic converters: How can you scrub the pollution from a car exhaust?
• Combine harvesters: How do these giant machines separate the wheat from the chaff?
• Cranes: Why are there so many different types of cranes?
• Diesel engines: Why are diesel engines more efficient than gasoline engines?
• Electric bicycles: How do they work and are they worth the extra cost?
• Electric cars: Why are they taking so long to catch on?
• Elevators: What happens if the cable breaks?
• Helicopters: If they don't have giant wings, like planes, how do they stay in the air?
• History of flight: How did airplanes evolve?
• Hot-air balloons: Why is the hot air so important?
• Hovercraft: Why does it help to float above the sea?
• Jet engines: How fast is air travelling when it roars out of the back?
• Jet Ski® and Sea-Doo®: How can you shoot waves without a propeller?
• LIDAR: How do self-driving cars find their way round the world?
• Outboard motors: Do they really weigh as much as a man?
• Parachutes: How come they don't simply rip into pieces?
• Pneumatic (Lamson) tubes: How can you send money round a building with a blowpipe?
• Propellers: Why are they called screws?
• Regenerative brakes: How can brakes recycle energy?
• Rollercoasters: Where's the best place to sit for a terrifying ride?
• Ships and boats: How do they float? How do we stop the water slowing them down?
• Snowmobiles: How do they move so fast through the worst of the winter?
• Steam engines: If we love them so much, why don't they still pull trains today?
• Submarines: What stops them getting crushed by water pressure?
• Tractors: How do they power the implements they drag behind them?
• Turbochargers: How do you squeeze more power from the same amount of fuel?
• Wheels and axles: Why do wheels reduce friction?
• Wind tunnels: How can you test a plane without sending it up in the air?