I kinda don't get it O.O how could a thumb doesn't have curve? ? Did I miss something??
*search on Google* oh .... O.O .... *....
...
Oh... waow.... I've never noticed this thing before.. ... ...
Then... I see that both of mine are straight. But the left one is a little bit more curvy. (I am right-handed). ah, wait. no. Now the right one is curvy. Oh my, why is this, this makes me confuse, and a little worried about my thumbs... @@;;;;