It's summer and time for opening the windows, lounging in the sun and embarking on countless outdoor activities. Among health professionals, summertime is also called "trauma season," since the rate of accidental injuries usually spikes. Children are especially at risk during the summer, with unintentional injuries such as drowning, falls and accidents with bikes and other wheeled sports the leading cause of death in children ages 14 and younger, according to the National Center for Health Statistics. The Centers for Disease Control and Prevention offers extensive advice for reducing the hazards of swimming, noting that survivors who came close to drowning nonetheless may have brain damage resulting in long-term cognitive disabilities such as learning problems, or worse. Most young children who drowned in pools, the CDC noted, were last seen inside a house and had been out of sight for less than five minutes. The CDC also offers safety tips, either online or by calling to request information, on preventing accidents while biking, skateboarding, horseback riding and numerous other outdoor activities. On average, 17 children in the United States died each day from these preventable injuries between May 1 and Aug. 31, 2004, according to a new report from Safe Kids USA citing the most recent year for which figures are available. In total, 2,143 children were killed in accidental injuries in 2004. Lucile Packard's Agarwal, who has worked at the Santa Clara Valley Medical Center as well, has a particular interest in preventing the tragedy of children falling from open windows. She explained that most falls from windows occur with younger children who climb on furniture near windows to get a look outside. Or they sit on window sills, leaning against a screen that gives way. Besides accidental injuries, there's the risk of sunburns to contend with during the summer months. Even a few serious sunburns can significantly increase chances of developing skin cancer later in life, warned the CDC. The chief advice for sun protection is familiar. Slather on at least 15 SPF sunscreen and do so every two hours, regardless of promises from sunscreen manufacturers of longer-lasting protection. Children and adults should also try to reduce sun exposure between 10 a.m. and 4 p.m., when skin-damaging UV rays are at their peak. A moderate amount of sun is healthful, as it generates vitamin D production in the skin, which not only is necessary for building strong bones and teeth, but is increasingly linked to the prevention of cancers and other diseases.