Hopkins High School

Police said the family called authorities after they tried to wake him up for school Friday morning but found him unresponsive.

Researchers at Johns Hopkins University School of Medicine in the US evaluated the effects of calcium supplements versus calcium in the form of food.

Augusta Uwamanzu-Nna, whose parents came to the U.S. from Nigeria, has until May 1 to decide whether she'll attend one of the prestigious northeastern universities. She also can choose from Johns Hopkins University, Massachusetts Institute of Technology, New York University and Rensselaer Polytechnic Institute.

The research, published in the journal Nature, revealed that an enzyme called PDE-9 interferes with the body's natural "braking" system needed to neutralise stress on the heart.

Police said the family called authorities after they tried to wake him up for school Friday morning but found him unresponsive.

Researchers at Johns Hopkins University School of Medicine in the US evaluated the effects of calcium supplements versus calcium in the form of food.

Augusta Uwamanzu-Nna, whose parents came to the U.S. from Nigeria, has until May 1 to decide whether she'll attend one of the prestigious northeastern universities. She also can choose from Johns Hopkins University, Massachusetts Institute of Technology, New York University and Rensselaer Polytechnic Institute.

The research, published in the journal Nature, revealed that an enzyme called PDE-9 interferes with the body's natural "braking" system needed to neutralise stress on the heart.