What historical event began global warming and acid rain

What happens to isotopes that are unstable?

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Light waves can move through , but they travel fastest when they move through a(n) .