Gokula krishnan asked 8/22/2015 How can scientists say that "even light can't escape from black hole's gravity"? Does this means light has mass?
Anonymous asked 1/7/2015 What is a shadow? What is a reflection? What is the difference between Shadow and Reflection?
Anonymous asked 9/25/2016 Let's say you have an acorn. You lay down the acorn on a flat surface, and then roll it across the surface. Would it roll in a straight direction or in a circular direction? If the acorn rolls in a circular direction, how?