Size Matters And Don't Believe Anyone Who Tells You Otherwise

So Stephen Hawking contends that if aliens do exist, we don't want them here because they will enslave us with their superior technology. Of course, as everyone less nerdy than he knows, there is always the issue of size. It's hard to be an alien conqueror if your intelligent conqueree would just step on you. Although, sometimes I doubt the intelligence of human beings. Case in point, the strato pen. As the Russians bewilderedly pointed out to the Americans, who invented this pen that works in zero G, "pencil."