Diving and snorkeling at Silfra, Iceland, on the fault line where the Eurasian and North American tectonic plates meet. The water is some of the clearest on this planet - it comes from the Lángjökull glacier, and takes between 30 and 100 years to filter through lava rock into the lake at Thingvellir National Park, leaving it crystal clear.
Love this! Food is more than just calories. It's nutrients. When you change the oil in your car, you could put 4 qts of fresh oil that will help the engine run smoothly and clean out the crap, or you could put 4 qts of used black gross oil which will gunk it up more, causing more problems. It's still 4 qts of oil. And it's what we do with our food.