In search of time travelers

(Phys.org) —It started over a poker game. Astrophysicist Robert Nemiroff and his students were playing cards (for chips) last summer, chatting about Facebook. They wondered: If there were time travelers among us, would ...

Science shows why Doctor Who is so special

As Doctor Who's 50th anniversary looms, time travel is everywhere – on the screen, at least. Famously, the Doctor can whizz through the years using a "dimensionally transcendental" machine, the TARDIS, and make changes ...

3-D Earth model more accurately pinpoints explosions

During the Cold War, U.S. and international monitoring agencies could detect nuclear tests and measure their size. Today, they seek to pinpoint much smaller explosives tests. Under the sponsorship of the National Nuclear ...

Upgraded urban travel 'could save $70 trillion by 2050'

Urban planners must re-invent city transportation systems to save up to $70 trillion globally in the next 37 years, a study said on Wednesday citing the examples of Belgrade, Seoul and New York City.

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