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You might think that it's just fish that have gills, but there are several species of sea snake that breathe through their skin as well. For example, the Hydrophis cyanocinctus has been found to breathe through the top of its own head. It has a small hole and collection of blood vessels at the top of its head for picking up oxygen from the seawater and sending it to the reptile's brain while it moves underwater.

Feet are enormously complex parts of the body. Each foot contains 26 bones, as well as 33 joints and 19 muscles, which work together to allow for a huge range of motion and movements. But many of these bones remain cartilage throughout a person's childhood, slowly ossifying into bone as the years go on.

Food waste is a huge problem. How big? About 931 million metric tons. That's how much food that researchers with the United Nations estimate was wasted in 2019, according to the Food Waste Index Report 2021, which surveyed 54 countries, finding that the majority of wasted food (61%) comes from homes while restaurants and other food services produce 26% of wasted food. Grocery stores make up just 13% of food waste. If you need a pick-me-up, read through these 50 Feel-Good Facts Guaranteed to Make You Smile

Few odors are as pleasing as "new car smell"—and not just because it's nice to be in a brand new car. But while the scent may be strangely satisfying, the fact is that it's pretty much just a combination of 50+ chemicals (known as "volatile organic compounds") that are released into the car, decaying quickly over time. The concentrations found in a typical new car aren't dangerous, but among the VOCs that make up much of that new car smell are those found in nail polish, auto fuel, and petroleum.

Much like the rings of a tree can tell you its age and provide clues about the life it has lived, so too does the long tusk of the narwhal. Recent research led by a bioscience professor at Denmark's Aarhus University has shown that this peculiar arctic whale adds a layer to its distinctive tusk each year. And not only do these layers offer insight into the age of the narwhal (they've been known to live up to 50 years) but the conditions in which they lived—such as level of pollution, temperature levels, and even what their diet consisted of. You are what you eat!