While steroids enhance muscle growth, they also cause liver damage and 'roid rage.
Some bee and wasp species have developed a killer instinct.
During migration, birds' digestive system partially shuts down to conserve energy for flight.
Due to cold temperatures, penguins have lost the majority of their taste receptors.
Ancient Eastern herb, gou teng, may be the best way to treat Parkinson's Disease.
Tryptophan's sleepy effect is maximized by foods heavy in carbs.
Polar bears have evolved so that they don't need to drink liquid water.
Iron can be used by our body for good or bad, depending on which cells get a hold of it.
Climate change may not only devastate food crops, but also diminish plants' nutritional value.
Alzheimer's, a brain disorder associated with memory loss, is caused when plaque accumulates on neurons, killing the cells off and causing brain shrinkage.