Studies in humans, monkeys and other mammals have found that mothers have different breast milk 'recipes' depending on the sex of their newborn – boys often get milk that's richer in fat or protein, while baby girls get higher calcium levels and more milk overall. These findings could help improve baby milk formulas.

This is a giraffe chewing on an impala skull. The behaviour sometimes seen in wild giraffes is called osteophagia, which literally means "bone eating". It's thought the bones help provide them an additional source of calcium and phosphorous.

A seagull on a glass roof looking really cute.

Seagulls are able to drink seawater to survive thanks to salt glands just above their eyes. These glands eliminate excess salt from the seawater and flush it out of the birds' nostrils in liquid form, an action that's often mistaken for a sneeze.

Aerogel or "frozen smoke" is the world's lowest density solid. This hologram-like substance is 99% air. It is almost impossible to feel if you hold it in your hand but when you poke it, it feels like Styrofoam.

A new study has found that most adults, everywhere in the world, are playing host to face mites. They live in our hair follicles, eat the oils we secrete, mate with each other near the surface of our skin, and sometimes venture out at night.

Deinococcus radiodurans is an extremophilic bacterium, one of the most radiation-resistant organisms known. It can survive cold, dehydration, vacuum, and acid, and is therefore known as a polyextremophile and has been listed as the world's toughest bacterium in The Guinness Book Of World Records.

Did you know that McDonald's famous burger, the Big Mac, contains addictive ingredients inside its bun? Yes, it's true, the bun isn't as harmless as your probably thought.

The Big Mac bun contains high levels of high-fructose corn syrup and sodium. Both ingredients are addictive, and therefore make your body crave more of them. These ingredients are also harmful and can cause obesity, diabetes, and heart disease, BUT not directly. Remember, the higher sweetness of high-fructose corn syrup increases craving and consequently the amount consumed. Obesity isn't caused by diet alone - when combined with decreased physical activity, that is when it contributes to the weight gain epidemic and personal health problems.

It's no wonder homemade burger ...

Brain freeze is the name used to describe the sensation you get when you consume something really cold, really fast. The scientific name for this temporary cold-stimulus headache is sphenopalatine ganglioneuralgia.

When something extremely cold touches the upper-palate (roof of the mouth), blood vessels in this region dilate to increase blood flow to counter the cold. The homeostatic triggers in your body perceive the cold as a threat to the brain, thinking the brain is in danger from the cold. As the warm blood rushes to your brain, this build-up of blood pressure causes the pain you feel. While brain freezes are not dangerous, they are slightly uncomfortable, so the best way to make it quickly go away is to rub or press your tongue against ...