RFK, Jr. fought mercury pollution for years, but he is now in an administration that wants to make it easier for industries ...

Nuclear fusion reactors, if and when they become practical, will need a steady supply of fuel. The source of that fuel is the ...

Usually lost in the sun's glare — so in the daytime sky — from our point of view on Earth, Mercury only occasionally becomes visible just before or after sunset. The latter is the case this ...