Washington, Apr 3: US President Barack Obama''s half-sister has inked a book deal.

The first book of Maya Soetoro-Ng, a teacher in Hawaii, is inspired by Maya and Barack's mother as well as by Maya's four-year-old daughter.

In `Ladder to the Moon', Maya pays homage to her mother's tradition of storytelling - and celebrates her mother's enduring legacy of service, reports The Politico.

The tome will be published by Candlewick Press.

Washington, Apr 3 : Almost 60 percent of American college students have been in a "no commitment" and "no romance" sexual relationship with a friend, which is also touted as a "friends with benefits" relationship, according to a study.

Conducted by researchers at Wayne State University and Michigan State University, the study showed that the possibility for romantic feelings, and a lack of communication, could complicate such an arrangement.

The study focussed on why college students had such relationships at all.

Washington, Apr 3 : Women with a family history of breast cancer can reduce their risk of developing the disease through regular exercise, say researchers.

With the evidence that reducing estrogen in the body reduces cancer risk, and that elite female athletes experience a drop in estrogen levels that often cause them to stop ovulating and menstruating, University of Pennsylvania researchers are conducting further studies to understand whether reduce their risk.

You could be using “virus batteries” to power your cars, cell phones, or other electronic devices, sometime in future! Well, the researchers at the Massachusetts Institute of Technology (MIT) have announced that they have developed futuristic low cost batteries using viruses.

Washington, Apr 3 : Supervised exercise through pulmonary rehabilitation can help improve the condition of patients with chronic obstructive pulmonary disease (COPD), according to a study.

Richard Casaburi, at the Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center (LA BioMed), has found that supervised exercise can reduce the feelings of breathlessness, increase the tolerance for exercise, and improve quality of life in COPD patients.

Washington, Apr 3 : Hypodermic needles often lead to medical complications when the jab penetrates too far in the skin. However, now MIT researchers have developed a novel needle that aims to reduce the risk.

Based on the drilling technique from the oil industry, scientists have developed a mechanical device that automatically stops once the needle tip enters a cavity or lower-density tissue.