query

When serving, does the ball have to be thrown straight upwards such that it falls straight down? just wondering if the ball can be thrown in such a way that it's flight path is more of an arc- shape so that contact with the ball can be made in a different position relative to the table to where...

Hi guys, I have a few old and new sheets of DHS Hurricane lying around I bought the rubber just to try it but I'm not a fan of concrete hard Chinese tacky rubbers. I was just wondering if I purchase some Dian Chi oil (from TTnPP) will it soften up the sponge to say IDK... The hardness of...