February 12, 2019

Who was Thomas Edison?

Thomas Edison is famous for inventing the light bulb in 1878 in New York, USA. Thomas Edison didn’t invent electricity – a natural form of energy […]
February 12, 2019

Why do hot-air balloons float?

Hot-air balloons are the oldest type of flight technology (pre-dating the airplane by more than 120 years) for a reason: the principle behind “lighter-than-air” flight is […]
February 12, 2019

Why do helium-filled balloons float?

Helium balloons float for the same reason a beach ball floats in water. The balloon and the air inside it weigh less than the equivalent amount […]
February 12, 2019

Why do airplanes fly?

Planes soar with the greatest of ease because of two forces: thrust and lift. Thrust is generated by the engines, which use either propellers or jets […]