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""Our results raise the hypothesis that these risky behaviors, such as experimenting with drugs or having unsafe sex, are actually driven by over activity in the mesolimbic dopamine system, a system which appears to be the final pathway to all addictions, in the adolescent brain," Poldrack said."

Join Bill Nye as he delves into the Greatest Discoveries in Biology. This program explains how the early use of microscopes and Anton Van Leeuwenhock's accidental discovery set the stage for studying microorganisms. It explores 19th century research breakthroughs and covers cell division, sex cell division, and cell differentiation. Learn how the discovery of mitochondria has helped us understand reproduction, ancestral lines, and cancer; how cells convert sugars, fats, and proteins into energy in the Krebs Cycle; and how they communicate through neurotransmitters and hormones. Explore the process of photosynthesis and how the discovery of the ecosystem process bridged biology with physics, chemistry, and other fields of science that describe the environment.

"Nearly 20% of women in the US are raped or suffer attempted rape at some point in their lives, a US study says. Even more women, estimated at 25%, have been attacked by a partner or husband, the Centers for Disease Control said."

"Certain trees are able to clone themselves, which raises the tantalising possibility that they could effectively "live forever". But a study published in the journal PLoS Biology has dashed that hope. "