is it good to see me back?

First of all, let me show you what i came across while reading a science magazine:

" the whole solar system is moving at 250 km/s, so it takes 250 million years to complete a revolution around the milky way"

Don't you think it's amazing?!

... And secondly, i want to ask you a question that made me laugh the first time i read it:

" can the sterility be hereditary? "

See You Soon!