Cambridge, Massachusetts - If you leave a cube of Jell-O on the kitchen counter, eventually its water will evaporate, leaving behind a shrunken, hardened mass — hardly an appetizing confection. The same is true for hydrogels. Made mostly of water, these gelatin-like polymer materials are stretchy and absorbent until they inevitably dry out.

Dallas, Texas - A blood test that leads to the rejection of donor hearts may be unnecessary in predicting whether a heart transplant will succeed or fail, according to new research in Circulation: Heart Failure, an American Heart Association journal.

Philadelphia, Pennsylvania - Following cancer prevention guidelines on diet and physical activity consistently reduced overall cancer incidence and mortality, according to results of a systematic review published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.

Washington, DC - Americans spent $30.2 billion - $28.3 billion for adults and $1.9 billion for children - out-of-pocket on complementary health approaches, according to a nationwide survey. These approaches include a group of diverse medical and health care systems, practices, and products such as herbal supplements, meditation, chiropractic, and yoga. This amount represents 9.2 percent of all out-of-pocket spending by Americans on health care and 1.1 percent of total health care spending.

Washington, DC - The National Institutes of Health has selected 52 innovative, research-oriented students for the 2016-2017 Medical Research Scholars Program (MRSP). A year-long residential program, the MRSP introduces medical, dental and veterinary students to cutting-edge research, and is part of NIH's goal of training the next generation of clinician-scientists and biomedical researchers.

Baltimore, Maryland - A study of 430 hospitals in the developing world found that more than one-third lacked running water, a deficiency that can lead to unsanitary conditions for patients in general and dangerous conditions for those who need surgery.