Not a real quiz but..........

Originally posted by Bob Lentil
This one's a stretch:

4) 21 D S D of the Y = 21 decades since discovery of the Yttrium.

In case you wanted to know, the element Yttrium was discovered in 1794 by Johann Gadolin. It was named after Yterrby, Sweden. It is used in color TVs and radars.

I'd love to say yes Bob for the thought processes if nothing else but............No!

Rick was close talking about days and years.