Energy is the defining property of our physical world, and therefore the most important tool for understanding nature, hence the most commo...

Time is a special thing. It is always with us. We live in it. It surrounds us, we can't get rid of it. It seems to be part of the phy...

Why does the LIGO, the gravitational-wave observatory work? In an earlier thought , there was an argument against the used method. One ...