Dad's still got it

Daddy is so witty and humorous, but recently mommy has not been spending either quality or quantity time with him, so mommy was happy to know Daddy's still got it ;-) Overheard at dinner with his M.S. advisor Prof and friends:

- Prof shows Rian three fingers, and Rian is filled with glee. Prof says: does he always do that? Daddy says, ya, prime numbers always get him :D hehehehe...

-Prof asks Dad: did he learn how to integrate yet? Daddy says: Not sure, but he's very good at derivatives - he can disintegrate anyone!