While a baby's experiences and memories are vital to his/her development, most of us can't remember what we did before our third birthday. Why is that?

It may be that as babies we just don't have the necessary mental equipment to store and organize memories properly, a hypothesis strengthened by the famous case of Henry Molaison. Molaison was unable to remember any new events that happened to him after a faulty brain operation. Though he still had temporary short-term memory and could learn new skills, he couldn't retain information for long.

We know that neurons continue to be added to our brains in our early years, and it's possible that when this building process has finished, memories can start to form.

Another hypothesis is that our sense ...

Men’s noses are 10% larger than female's.

Males generally have leaner muscles and need more oxygen for muscle growth and maintenance—and larger noses mean more oxygen can be breathed. A new study found that the difference in nose size between males and females of European descent starts showing in early puberty, when 95% of body weight gain in males comes from fat-free mass, compared to 85% in females.

Often dealing with hot, sweaty climates, tigers have learned to enjoy water, using it as a way to cool off, capture prey and relax.

A hiccup is an involuntary spasm of the diaphragm that typically repeats several times a minute. The sudden rush of air into the lungs that's created by each spasm causes the glottis to close, creating the "hic" noise. A bout of hiccups generally resolves by itself, although many home remedies are in circulation to shorten the duration. The medical term for hiccuping is singultus.

While many cases develop spontaneously, hiccups are known to develop often in specific situations, such as eating too quickly, taking a cold drink while eating a hot meal, eating very hot or spicy food, laughing vigorously or coughing, or drinking an excess of an alcoholic beverage. Hiccups may be caused by pressure to the phrenic nerve (located in the neck regi ...

The wolf spider is the only species of spider that carries its offspring this way -- live, hatched and wriggling on her back! After a gestation of 9 to 27 days (dependent on temperature) during which the eggs are carried around in a silk globe attached to the mothers stomach, the offspring hatch and climb on to her back. They stay there until they're ready to hunt alone.

Wombat droppings are cube-shaped. This prevents them from rolling away when marking their territory. These cube-shaped poop looks like, but doesn't taste like chocolate brownies.

Wilhelm Conrad Röentgen, a physics professor at the University of Wurburg in Germany, was experimenting with electric current flow in a partially evacuated glass tube in 1895 and one night he noticed a glow caused by an unknown radiation. He named the phenomenon x-radiation and few months later he took the first x-ray photograph of a body part: the bones in his wife’s hand – and one can even see her wedding band. The first even x-ray image was of a key.