Jin He,

I am responding once, and only once, to defend myself against your insults.

I submit my writings to editorial scrutiny, and I do not insult people who offer advice. Unlike you, I am not so self-absorbed or arrogant as to claim to be the next Carl Sagan, though I think my work is quite good.

I tried to offer helpful suggestions, and all you did was insult me.

What are we to make of that? I have a few choice adjectives in mind, but I'll allow others to decide for themselves.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)