There isn't a single device that truly "conquers gravity." Gravity is a fundamental force of nature, and we can't simply "turn it off" or "reverse" it. However, we can use our understanding of gravity to achieve seemingly gravity-defying feats:

* Airplanes and Rockets: These vehicles use the principles of aerodynamics and thrust to generate lift, overcoming the force of gravity.

* Helium Balloons: Helium is lighter than air, so balloons filled with it experience buoyancy, making them float upwards.

* Magnetic Levitation: This technology uses powerful magnets to levitate objects, seemingly defying gravity.

* Space Elevators (Concept): This theoretical structure would extend from Earth into space, using a counterweight to balance the force of gravity.

Important Note: While these examples demonstrate our ability to manipulate the effects of gravity, they don't actually "conquer" it. Gravity still exists, and these technologies simply exploit other forces to achieve desired outcomes.

The search for a device that truly "conquers gravity" is a fascinating one, but it's important to approach it with scientific skepticism. While fictional concepts like anti-gravity devices are popular, they currently lack scientific backing.