SciShow
What If the Large Hadron Collider Made a Black Hole?
Making a black hole in a particle accelerator sounds… a bit dangerous, to say the least, but scientists think that it could be possible! Here's why it probably wouldn't be dangerous -- and might even teach us something.
Khan Academy
Khan Academy: Inverse Square Law (Deflection Method)
An experiment to try to measure the change in the force of a magnet over a distance using the deflection of a compass. What is wrong with this approach?
Khan Academy
Khan Academy: Inverse Square Law (Method of Oscillation)
Here we compare the speed of compass oscillation vs. distance from a magnet. What kind of relationship do we observe? Is it linear? [2:08]