How can I get rid of the Hand in Photoshop!

In the middle of a project one day, I try to switch to a tool but instead of the apprropriate tool I get the "hand" instead! I kept switching to different tools. No luck! Finally I Google "How can I get rid of the Hand" and got various answers. Most worthless. But someone, said "hit the space bar." It works. This has happened repeatedly since the first time and I always waste time before remembering the remedy. So I decided to document the answer in my own blog.