Photoplethysmography (PPG) is increasingly used in digital health, exceptionally in smartwatches. The PPG signal contains valuable information about heart activity, and there is lots of research ...

During a particularly hot summer in 1988, James Hansen testified before a congressional hearing on the dangers of global warming. The night before his testimony, committee members had opened the ...

1 Department of Public Health and General Practice, Norwegian University of Science and Technology (NTNU), Trondheim, Norway 2 Department of Human Movement Science, Norwegian University of Science and ...

In seeming defiance of the second law of thermodynamics, nature is filled with examples of order emerging from chaos. A new theoretical framework resolves the apparent paradox Science has given ...