orenht

should be

  typedef struct {uint8_t *data, *dataend} 

Do you have any example of that different usage? I can't come up with one

I think it's not a one-time-investment at the beginning which is being measured, but a DCA (Dollar Cost Averaging) over a long period.

You accidentally duplicated the cs50 link. Where were you taking the operating systems class? I'm very interested :)

Have you been using it yourself to trade? How good would you say it is?

I don't like the notion of "hacking my brain".

First, it can create long term unwanted needs, such as requiring you to treat yourself for every little achievement. This could lead to a lot of things - weight gain, guilt, or all kinds of addictions (coffee, games..)

Second, I think that improvement is achieved by slow and consistent practice. "Hacks" are... well, hacks. They aren't supposed to be used over and over again.