Bismarck, N.D., fell to -39°F, six degrees from its all-time coldest day. The cause of the week-long deep freeze? A polar vortex collapse. Now, meteorologists are calling for another collapse in ...
If you are using an iPhone or iPad, your screen will Auto-Lock after a set amount of time while playing the ... to navigate the TARDIS through the vortex. On desktop you can use a mouse.
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