Toward a better understanding of 'fake news'

Duncan Watts, a Penn Integrates Knowledge Professor and computational social scientist with appointments in the Annenberg School for Communication, School of Engineering and Applied Science and the Wharton School, has published ...

Toward exawatt-class lasers

Ultra-intense lasers with ultra-short pulses and ultra-high energies are powerful tools for exploring unknowns in physics, cosmology, material science, etc. With the help of chirped pulse amplification (CPA) (2018 Nobel Prize ...

The death penalty, an American tradition on the decline

Capital punishment has been practiced on American soil for more than 400 years. Historians have documented nearly 16,000 executions, accomplished by burning, hanging, firing squad, electrocution, lethal gas and lethal injection. ...

Climate change affects breeding birds

The breeding seasons of wild house finches are shifting due to climate change, a Washington State University researcher has found.

How much does a kilogram weigh?

The kilogram doesn't weigh a kilogram any more. This sad news was announced during a seminar at CERN on Thursday, 26 October by Professor Klaus von Klitzing, who was awarded the 1985 Nobel Prize in Physics for the discovery ...

Researchers developing a new balance for the new kilogram

Technische Universität Ilmenau and the Physikalisch-Technische Bundesanstalt (the National Metrology Institute of Germany) are developing a balance which is required for measuring the redefined kilogram that will be introduced ...

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