You can download Boin & mine grid coin on Apple. Not only that you will be helping Science and the Medical Field. World Community grid is a great project. Working on cancer research, cures for Zika, Ebola, Aids & more. You can learn more by reading @ dutchs posts here. https://steemit.com/gridcoin/@dutch/happy-new-year-from-new-zealand-team-gridcoin-i-expect-great-things-for-2018

I have a link to world Community grid if you want to look more into it. https://join.worldcommunitygrid.org?recruiterId=1051345&teamId=BBNGDQS832. It is a affiliate tag to earn a badge for getting people to sign up.
Also upvoted your post. Good luck what ever you chose to mine.