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John Rennie
  • Member for 11 years, 5 months
  • Last seen this week
531 votes
Accepted

Did the Big Bang happen at a point?

339 votes
Accepted

Why are four-legged chairs so common?

222 votes

Why does ice cream get harder when colder?

198 votes

Why does Stephen Hawking say black holes don't exist?

177 votes

How can time dilation be symmetric?

142 votes
Accepted

Why doesn't a nucleus-like body made up of just neutrons exist?

139 votes
Accepted

Why doesn't water actually perfectly wet glass?

128 votes

How is 6W equivalent to 40W, as claimed by adverts for LED light bulbs?

114 votes
Accepted

Why doesn't the motion of a car affect the frequency of radio stations?

111 votes
Accepted

Does juggling balls reduce the total weight of the juggler and balls?

110 votes
Accepted

Why is the period of a geostationary satellite not exactly 1440 minutes?

108 votes

What is the connection between special and general relativity?

107 votes
Accepted

When I boil a kettle, what stops all the water from turning (exploding!) in to steam in one go once it reaches 100°C?

106 votes

What is time, does it flow, and if so what defines its direction?

102 votes

Why does the Sun's (or other stars') nuclear reaction not use up all its "fuel" immediately?

100 votes
Accepted

Is light actually faster than what our present measurements tell us?

100 votes
Accepted

Could we send a man safely to the Moon in a rocket without knowledge of general relativity?

97 votes
Accepted

What is the relation between electromagnetic wave and photon?

96 votes
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Is there a frame of reference in which I was born before I was conceived?

93 votes
Accepted

Why do the big nuts always remain at top? The Brazil-nut Effect

88 votes
Accepted

Why doesn't oil produce sound when poured?

87 votes

What is time dilation really?

86 votes

Why do shadows from the sun join each other when near enough?

86 votes

What is the proper way to explain the twin paradox?

85 votes
Accepted

Why do gases have weight?

84 votes

Why is 7 TeV considered as a big amount of energy?

82 votes
Accepted

Why is Voyager 1 approaching Earth?

80 votes
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How long would it take me to travel to a distant star?

78 votes
Accepted

Why do wet objects become darker?

77 votes
Accepted

Can you exit the event horizon with a rocket?

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