Feature Articles
The vis viva dispute: A controversy at the dawn of dynamics
The need to augment Newtonian mechanics to encompass systems more complex than collections of point masses engendered a century-long dispute about conservation principles—George E. Smith
Water in polymer electrolyte fuel cells: Friend or foe?
If fuel cells are to do for the 21st century what combustion engines did for the 19th and 20th, designers must wrestle with the complex role of water—as reaction product, proton shuttle, and asphyxiant—Michael Eikerling, Alexei A. Kornyshev, and Anthony R. Kucernak
The man behind Bose statistics
A rich Bengali cultural tradition, British–Indian politics, and a two-year stint in Europe all helped Satyendra Nath Bose become a renaissance man as well as the originator of quantum statistics—Kameshwar Wali
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Reference Frame
Theory in particle physics: Theological speculation versus practical knowledge 
— Burton Richter
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