This thing happened, and the angels were watching with a smile on their face.
My husband, PhD in physics, always delighted when the girls show an interest in something scientific (he's given up on me) got out a very sensitive set of kitchen scales. He placed a key on the scales and then slowly lowered the magnet over the key from above.
The key weighed 17g. As the magnet got closer, closer, the key weighed less and less.
14g...11g... 9.25g... 5.67g...
At 4.3g, the key jumped up to meet the magnet. Whoof. Just like that.
Continued over at the Association of Christian Writers' blog, which is More Than Writers. Please join me over there; I post on the 23rd of every month, and there's loads of wonderful stuff on all the other days, too.