When a magnetic field moves through a conductor a current called an Eddy current is induced in the conductor due to the magnetic field’s movement. The flow of electrons in the conductor creates an opposing magnetic field to the magnet which results in damping of the magnet and causes heating inside of the conductor similar to heat buildup inside of power cords. The loss of energy used to heat up the conductor is equal to the loss of kinetic energy by the magnet.
And a note of caution if you decide to try this, these magnets are not for unsupervised children. In fact, everyone should be careful:
Neodymium magnets larger than a half inch are very strong and should be handled with extreme care since they can be dangerous. It is best to stick with neodymium magnets of quarter inch diameter or less.
There is an unusual looking monkey called the crested black macaque that is endemic to rainforests in Indonesia, which includes the island of Sulawesi. These striking black primates, sporting punk hairstyles and copper-colored eyes, first caught the attention and won the heart of wildlife cameraman and biologist Colin Stafford-Johnson 25 years ago. But since then, their numbers have dropped by almost 90 percent, so the filmmaker returns to the island to discover why and how he could help.
Upon his arrival, Stafford-Johnson finds a very different looking Sulawesi. An island once entirely covered in forest, is now undertaken with new roads, people and buildings. He meets up with the leader of a team of local biologists — Giyarto, or Ugi for short — who has been studying the macaques for seven years. Together they will make a film to show how special these monkeys are, hoping to involve the local community in protecting them before they disappear forever.
From the Ri Channel's View the Tales from the Prep Room series, this is how you make a fluidized bed of sand: Making Sand Swim. Watch how these solids suddenly behave a lot like a fluid as air escapes between the sand particles, causing them to float. It’s definitely one of the more strange and fascinating demonstrations that we’ve seen.
The next time that you’re in your local natural history museum, don’t just look at the large animals in the dioramas — really look for those hidden small animals, too: a brown-headed cowbird near a bison, a Botta’s pocket gopher peeking from a burrow, or a Blue Echo Butterfly on a flower. These smaller details in scenes get as much attention from museum staff as the central figures.