Here is a pretty cool science experiment with a levitating gyroscope. It is based on something called lenz’s law and here is an excerpt on it from wikipedia
Lenz’s law /ˈlɛnts/ is a common way of understanding how electromagnetic circuits obey Newton’s third law and the conservation of energy.[1] Lenz’s law is named after Heinrich Lenz, and it says:
If an induced current flows, its direction is always such that it will oppose the change which produced it.
Lenz’s law is shown with the negative sign in Faraday’s law of induction:
which indicates that the induced voltage (ℰ) and the change in magnetic flux (∂Φ) have opposite signs.[2] Lenz’s Law is a qualitative law that refers to the direction of induced current in relation to the effect which produces it without quantitatively relating their magnitudes.
Watch this thing float in the video on page 2
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