Duchenne muscular dystrophy is a relatively rare congenital disease which causes muscle degeneration and eventual death in teenagers.  

Around 1 in 3500 newborns is affected and by approximately 10 years of age, Duchenne patients are dependent on a wheelchair and in increasing need for care. They are not expected to make it to their late 20s and often die from heart or respiratory failure.

There is no current cure for Duchenne muscular dystrophy  but recently researchers from Bern, France, England and Sweden tested a promising active substance successfully.

Teenagers who own smart phones spend more time online – including during the night, which may affect their sleep. A new University of Basel study on more than 300 students reports that teenagers' digital media use during the night is associated with an increased risk of sleep problems and depressive symptoms. 

Though they only became ubiquitous around 2007, most teenagers nowadays own smart phones. Due to wireless Internet connections and cheap data rates, teenagers with smart phones spend more time online and communicate with their peers for less money – for example via WhatsApp – which has changed their digital media use pattern profoundly. 

The warm ocean temperatures that brought an endangered green sea turtle to San Francisco in September have triggered a population explosion of bright pink, inch-long sea slugs in tide pools along California's central and northern coastline. The Hopkins' Rose nudibranch, while no strange sight in Southern California, is rarely spotted farther north. A team of scientists, including experts from the California Academy of Sciences, believes this far-flung Okenia rosacea bloom--along with a slew of other marine species spotted north of their typical ranges--may signal a much larger shift in ocean climate and a strong forthcoming El Niño.

Understanding how baleen whales hear has posed a great mystery to marine mammal researchers. New research by San Diego State University biologist Ted W. Cranford and University of California, San Diego engineer Petr Krysl reveals that the skulls of at least some baleen whales, specifically fin whales in their study, have acoustic properties that capture the energy of low frequencies and direct it to their ear bones.

Baleen whales, also known as mysticetes, are the largest animals on earth, and include blue whales, minke whales, right whales, gray whales and fin whales. These whales can emit extremely low frequency vocalizations that travel extraordinary distances underwater. The wavelengths of these calls can be longer than the bodies of the whales themselves.

The third chapter in the ongoing saga of the "first direct image of gravitational waves through the primordial sky" has been written. The first chapter was in March of last year when the BICEP2 team announced that it had observed the portion of cosmic background radiation (the "fossil radiation" from the Big Bang) generated by gravitational waves. This would have been the first observation of the cosmological effects of the elusive phenomenon predicted by Einstein's theory of General Relativity. 

A new study indicates that sexual behavior among female university students in Sweden has changed during the last 25 years, with behavior now appearing more risky than before.

The surveys were taken as part of contraceptive counseling delivered at a Student Health Center in Sweden.