Our picks for the week of Aug. 15-21: 

• A living fossil is an organism that has retained the same form over millions of years and looks pretty much like it did eons ago. We've got 15 examples of living fossils to share — some recognizable and some not so much.

• Can a diet really detox your body? American celebrities seem to think so. Find out what seven of the most popular detox diets entail. 
• Guest column: Animal rights blogger Gary Smith describes the "training" of circus animals. It might make you squirm.

• Ah, Paris. Traveling there is always a good idea, but here's a surprise. Did you know you can take a low-impact vacation in Paris? Here's how.

NASA image of a star-forming cloud • Back across the pond, check out the Sierra Club's top 10 green college campuses.

• Some of the biggest casino resorts in Las Vegas are going green — and it's bringing patrons more than good luck.

• Our family blogger stumbled upon a tongue-in-cheek gallery of awkward breast-feeding moments and failed to see the humor. Then she posed a question: Why aren't we more supportive of breast-feeding?

• For our weekly celebrity update, we caught up with Ray Romano, Joe Mantegna, the male cast of 'Desperate Housewives', and others to find out how they're going green.

• Solar power for the home just got easier — and cheaper. Check out the plug 'n' go Sunfish. 

• And finally, forget the usual fare in the produce aisle. Here are 15 exotic fruits you may have never heard of — and what flavors to expect.

Plus: Don't miss the week in photos, including the image (above) of a star-forming cloud of dust and gas captured by a NASA telescope. 

MNN week in review: Living fossils and circus elephants
Catch up on the environmental headlines from the Mother Nature Network for the week of Aug. 15-21.