Top network posts

• 93 Why don't we use weights to store energy?
• 52 How do you know you have reached North or South Pole without GPS?
• 47 If I sliced the universe in half, would the slice go through a star?
• 44 What vehicle would be the best one to start a >1000 km travel in a post apocalyptic zombie situation?
• 41 When was Newton "not good enough" for spaceflight; first use and first absolute requirement for relativistic corrections?
• 35 How old do surviving children need to be to keep human civilization from failing?
• 33 Why does 60 Hz mean 60 refreshes and not 120?
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