Even in an age of digital reading, printed books are still in demand and can be donated if you're ready to make room on your bookshelf at home. The rule of thumb for donating books is this: If the book was published three years ago or less, donate it to your local library, which will resell the book at a fundraiser to raise money for its valuable work. If the book is older, donate it to a Salvation Army or Goodwill store, which will resell the book in-store. Either way you donate your books, be sure to get a receipt for tax-deduction purposes.

ANDREWS MCMEEL SYNDICATION

What could be the harm in picking up a shell or rock when you're snorkeling in the ocean? A lot, actually. According to the Natural Resources Defense Council, "picking up a rock or shell could expose the organisms or fish eggs beneath it to predators." And with coral reefs being home to 25% of the world's fish, small shifts like this can have a seismic effect if everyone does it. Leave snorkeling near coral to expert swimmers, and stay far away if you're a novice. Don't forget to opt for "reef-safe" sunscreen when swimming in the ocean, too.

ANDREWS MCMEEL SYNDICATION

Are you someone who turns on the shower in the morning and walks away so you can return to a warm shower? You're not alone, but you're wasting a ton of water. On average, about 2.5 gallons of water goes down the drain; even more if you're not diligent about returning immediately when the water turns warm. One way to save money and water is to install the kind of thermostatic shut-off valve that is gaining popularity in states like California. Essentially, it lets cold water flow from the showerhead, then automatically shuts off when hot water starts to flow. When you hear the water turn off, you know it's ready for a hot shower.

ANDREWS MCMEEL SYNDICATION