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Physics

John Crowe from Dublin asks,

If I knew the centre of the universe and began to travel toward it, would I begin to decrease in...

the answer

There is no center, the universe is as far as can be seen, the same all...

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Physics

bruce marshall from Davie asks,

In energy transformations, even on the subatomic level, is some energy always lost as thermal...

the answer

At a detailed level, your question invites considerable digression -- you...

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Biology

Nesa Xiong from Sacramento, CA asks,

How long does it takes your hair to grow? How many years and how many inches?

the answer

Scalp hair grows at about one millimeter every 3 days, on average. It's a...

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Physics

Dmitri from Toronto asks,

How do we know that universe is 13.5b years old, if time is not constant? The idea is the...

the answer

The age is taken to be the proper time (that is, the time measured by a good...

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