What decimal number is lying between 0.003 and 0.004?

Oh, dude, that's an easy one! The decimal number lying between 0.003 and 0.004 is 0.0035. It's like right in the middle, you know, splitting the difference between those two numbers. So, if you ever find yourself pondering the vast expanse between 0.003 and 0.004, just remember 0.0035 is chilling there, keeping the peace.