Adding noise for completely secure communication

How can we protect communications against eavesdropping if we don't trust the devices used in the process? This is one of the main questions in quantum cryptography research. Researchers at the University of Basel and ETH ...

Computational thinking, 10 years later

"Not in my lifetime." That's what I said when I was asked whether we would ever see computer science taught in K-12. It was 2009, and I was addressing a gathering of attendees to a workshop on computational thinking convened ...

Can defects turn inert materials into useful, active ones?

Demonstrating that a material thought to be always chemically inert, hexagonal boron nitride (hBN), can be turned chemically active holds potential for a new class of catalysts with a wide range of applications, according ...

How e-mail helped Yeltsin outfox 1991 coup plot

Boris Yeltsin never suspected how a precursor to the Internet helped him foil the August 1991 coup and bring down the USSR until he bumped into a blinking computer and noticed something called e-mail.

Fresnel lenses: High contrast and efficient focusing

The first Fresnel lens was installed in 1823 in the Cordouan lighthouse, where its beam was visible for 32 km. Since then, this lens design has been used in lighthouses, traffic lights, automobile headlights, magnifying glasses, ...

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