Boys and Girls...

"Anyone who says there is no difference between boys and girls never had a boy and a girl," says my friend Paulie.

Here, in a nutshell, is the difference so far.

Calanit builds with the blocks, Erez destroys whatever Calanit builds.

Calanit finds a dangerous object and hands it to us, Erez finds it and seeks to hurt himself.

Calanit never puts something in her mouth that doesn't belong there; Erez never finds something that doesn't go into his mouth.

...there's more, but that's the basics. :-)