From teleporters to time machines, sci-fi has been dangling shiny gadgets in front of us for decades. Which one would genuinely change your life if boffins finally pulled it off?
Put the items in your preferred order.
Teleportation
Skip the delays, engineering works and eye-watering fares. Just blink and you're in Brighton, Barcelona or bed.
Cure-all nanobots
Microscopic machines that hoover up cancer cells, mend dodgy knees and unclog arteries after one too many fry-ups.
True artificial general intelligence
Not another chatbot faking it, but a genuine thinking machine that could crack climate change while you nap.
Time travel
Whether it's stopping Brexit, reliving 1996 or having a word with your younger self, the temptation is enormous.
Lab-grown replacement organs
No more transplant waiting lists or dodgy livers holding you back. Grow a new one and carry on regardless.
Drag the photo to reorder
Rank these Doctor Who actors by the year they first appeared as the Doctor, earliest first.
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