Is Time Travel Possible?

Professor of physics at Drexel University, Dave Goldberg analyzes wormholes and cosmic strings to determine if time travel might be an achievable goal.

"General relativity makes a number of big predictions, including the idea that mass warps space-time. If you missed my column on falling into a black hole, the effect of this is that time runs slower near a massive body than far away. You could build a time machine, of a sort, by hanging out near the edge of a black hole, allowing the universe to age must faster than you, and then returning home...to the future. But since you were going to wind up in the future if you just waited long enough, this is kind of stretching the definition of time travel. What we really want to do is go into the past. If G.R. allows us to bend time, will it let us fold it back on itself?"

Car culture and suburban sprawl create rifts in society, claims study

New research links urban planning and political polarization.

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Politics & Current Affairs
  • Canadian researchers find that excessive reliance on cars changes political views.
  • Decades of car-centric urban planning normalized unsustainable lifestyles.
  • People who prefer personal comfort elect politicians who represent such views.
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How to split the USA into two countries: Red and Blue

Progressive America would be half as big, but twice as populated as its conservative twin.

Image: Dicken Schrader
Strange Maps
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  • Perhaps the best way to stop the infighting is to go for a divorce and give the two nations a country each
  • Based on the UN's partition plan for Israel/Palestine, this proposal provides territorial contiguity and sea access to both 'red' and 'blue' America
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NASA astronomer Michelle Thaller on ​the multiple dimensions of space and human sexuality

Science and the squishiness of the human mind. The joys of wearing whatever the hell you want, and so much more.

Flickr / 13winds
Think Again Podcasts
  • Why can't we have a human-sized cat tree?
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