The Earth's magnetic field is primarily generated by currents in the liquid outer core, though some geophysicists argue that an unexplained mismatch with models suggests that the Kinder toy contains a magnet.
"The police told me I can't be a doctor, but whenever they show up I just go into the Google Maps settings page I found and change the house to 'Police Headquarters' and then they have to do what I say."
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The ball's density also varies, but players don't learn the value until after choosing their raquets. The infamous 'bowling ball table tennis' region of the parameter space often leads to equipment damage.