Your library is closed today to celebrate American independence, but your card number will still get you into our online databases where you can commemorate the fourth by reading American history, or biographies of the founders, or trace your ancestors back to the Mayflower with the help of the geneaology databases, or scan magazine articles about the day, or any day... or any thing, what the heck? You're on holiday! Read whatever you want!
Here's a fun web site from Uncle Sam that answers every question you've ever asked about the Fourth of July. Here's Sam again with the Declaration of Independence with zoomable photos of the original, and here's Snopes on the fates of its signers.
Notice I did not link to a web site listing the ingredients in hot dogs. You're welcome.