At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.

Abstract: A systematic method to find short unstable periodic orbits embedded in chaotic attractors is proposed. The method is based on the construction of symbolic representations of trajectories, ...

Objective: To describe clinical, diagnostic and therapeutic characteristics of the periodic fever, aphthous stomatitis, pharyngitis and cervical adenitis (PFAPA) syndrome. Data source: Literature ...

School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, People’s Republic of China ...

Robert Philpot is a writer and journalist. He is the former editor of Progress magazine and the author of “Margaret Thatcher: The Honorary Jew.” LONDON — It is an ordinary object with an extraordinary ...

Matt Webber is an experienced personal finance writer, researcher, and editor. He has published widely on personal finance, marketing, and the impact of technology on contemporary arts and culture.

The number of atoms in 0.1 mol of a triatomic gas is: The empirical formula of a compound is CH₂O. If its molar mass is 180 g/mol, what is its molecular formula?

Diccon Hyatt is an experienced financial and economics reporter who has covered the pandemic-era economy in hundreds of stories over the past two years. He's written hundreds of stories breaking down ...

Ahmedabad: Following the murder of a Class 10 student by another student, the Ahmedabad city district education officer (DEO) issued strict safety directives to all schools, making periodic bag checks ...

Abstract: Simulation-assisted formulas to calculate propagation constant in uniform or periodic structures (FPPS) are deduced and verified through simulations in three types of structures. The FPPS is ...