John Dallman's user avatar
John Dallman's user avatar
John Dallman's user avatar
John Dallman
  • Member for 7 years, 8 months
  • Last seen this week
  • United Kingdom
102 votes
Accepted

How to tell a clone apart?

82 votes

How can humans coexist with an intelligent carnivorous species?

70 votes

Could we reach the earth's core using today's nuclear arsenal?

60 votes
Accepted

How would someone hide an asteroid in the void of space so only they could find it?

59 votes

My star will explode as a supernova. What can I do in order to ensure that my planet survives that?

59 votes

Why would space traders pick up and offload their goods from an orbiting platform rather than direct to the planet?

48 votes
Accepted

Humanity after 100 million years?

45 votes

How to protect shops in the medieval era against thievery?

41 votes
Accepted

Can a robotic army really defeat humanity?

41 votes

How would they learn astronomy, those who don't see the stars?

41 votes
Accepted

How might an astronomer discover they have been transported 50 years in the future?

35 votes
Accepted

Could we mine the Moon if we replaced the taken mass?

34 votes

Universal Phonetic Alphabet

34 votes
Accepted

What would cause horse-riding cavalry to return?

32 votes

The Earth is teleported into interstellar space for 5 minutes. What happens?

30 votes

Gravitational slingshots: could they be used to decelerate a spacecraft traveling at a small fraction of light speed?

29 votes

Is fire possible in this planet's atmosphere?

26 votes
Accepted

What would a planet with no moon look like?

24 votes
Accepted

Neural network used as "doping"

23 votes

Where should we store our brains?

22 votes

A person has composite memories from countless pasts - how would you detect this with modern medical equipment?

22 votes

Hiding a Continent

21 votes

Would life still be possible on Earth if its atmosphere suddenly became as dense as the Venusian?

20 votes
Accepted

How to set phaser to kill the mermaids?

19 votes

How safe it would be to look at the other planet in double-planet system with naked eye?

19 votes

How fast is too fast for travel inside the solar system?

18 votes

Are gunswords feasible?

18 votes

How to convey the scale of my humanoid without science or units?

17 votes

Can I send S.O.S in space with just a conventional cellphone?

17 votes
Accepted

Why would fighting arts be able to compete with reality warping?

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