All donations go to fund this site, which costs ~$100 / month to run:

Donations above this fund improvements to the quality of the site:

Larger donations will fund projects covering additional content acquisition, manual data entry, artwork, and the writing of the emails covering the best lectures.

Paypal: gary.sieling@gmail.com
Bitcoin:1CXf2g2fnxDodtEpbLAasSG1Pe9Wo2DNMU

Custom sponsorhip arrangements are also available.