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We all know that you can travel through time in a wormhole, right? The only trouble is that wormholes have a tendency to collapse, which prevents anything from passing through them. However, help is at hand, with a simple pair of mirrors. All you need is two uncharged mirrors (or metallic plates) in a vacuum, placed a few micrometers apart-make sure there is no external electromagnetic field. Now comes the Casimir effect, which is a physical force arising from a quantized field between the two mirrors.

This quantum electrodynamic force produces a mass-negative region of space-time between the mirrors, which could stabilize a wormhole, and allow faster-than-light travel. Theoretically, you could travel to the past, but not the future-so you couldn't get next week's winning lotto numbers, unfortunately. Another fly in the ointment is that the stable wormholes produced by the mirrors are infinitesimally small, so don't plan a holiday to visit your ancient ancestors just yet.

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