The 24th International Book Fair is on this week in Jerusalem. It happens every two years and it is always a pleasure to experience.
Yesterday I saw LOTS of books, but one exhibitor was promoting maps and globes.
Don't you just love maps and globes?!
But I did a double-take when I noticed one globe was levitating as if by magic:
"How does that work??" I asked the seller lady.
Like a magician proving there were no strings attached, she instinctively passed her hand above the globe. She was flustered when the earth suddenly fell out of orbit.
But she did know to tell me that it was held up by an electromagnet.
Back home, I found this explanation at ThinkGeek:
"A magnetic field sensor continually measures the height at which the globes are suspended. This sensor feeds that data into a micro computer in the base of the unit. This computer then calibrates the electronic magnets at the top of the frame based on the distance between the globes and the top magnet to keep the globes correctly positioned."
Pretty cool, eh?
The ABC Wednesday group (join us!) is celebrating the letter E tonight.
Hope you enjoyed the enchanting electromagnetic earth globe. Come back tomorrow for more about the Jerusalem Book Fair.