POSSIBLY the question, What is the fourth dimension? may admit of an indefinite number of answers. I prefer, therefore, in proposing to consider Time as a fourth dimension of our existence, to ...

The spectral dispersion of ultrashort pulses allows the simultaneous focusing of light in both space and time, which creates so-called spatiotemporal foci. Such space–time coupling may be ...

Season 2, The Space Museum: The Dimensions of Time The Dimensions of Time Back on the proper time track, the travellers take steps to change the future.