Explorers Club

Everybody knows that Sharpies are “permanent” markers—and permanent means once the ink is on something, it’s nearly impossible to get it off, right?

Well, not quite. The Explorers learned in April 2010 how to do a variation of the classic tie-dying activity with Sharpies and rubbing alcohol.

At the end of April 2009, the Explorers investigated the properties of density, using what was surely one of the strangest contraptions to ever appear in (and above) their schoolyard.

As everyone knows, a hot air balloon rises because of...well, hot air. No helium or other "trick" is used, just the properties of air itself. How does this work? It all has to do with density.