Who is Hadley Wickham? Actually I was not quite sure until I received an email from his major professor Di Cook just now… But I have already noticed this interesting guy a couple of days ago, or more definitely speaking, I just noticed his notice about my website.

The other day when I was reading the statistics about my homepage, I noticed that there was a special link (officially called “HTTP referer”) in the list of referring sites: http://crantastic.org/packages/1290. This domain name is really fantastic! Following this site, I just found his homepage here: http://had.co.nz/
I wonder whether Hadley will notice this notice about my notice of his notice of my website, anyway, guys who have noticed my notice about his notice of me are all noticed now. Also, keep notice that your notice of this notice is noticeably not worth noticing, and may be noticed by those who noticed you noticing this notice.
Donate
As a freelancer (currently working as a contractor) and a dad of three kids, I truly appreciate your donation to support my writing and open-source software development! Your contribution helps me cope with financial uncertainty better, so I can spend more time on producing high-quality content and software. You can make a donation through methods below.
-
Venmo:
@yihui_xie, or Zelle:xie@yihui.name -
Paypal
-
If you have a Paypal account, you can follow the link https://paypal.me/YihuiXie or find me on Paypal via my email
xie@yihui.name. Please choose the payment type as “Family and Friends” (instead of “Goods and Services”) to avoid extra fees. -
If you don’t have Paypal, you may donate through this link via your debit or credit card. Paypal will charge a fee on my side.
-
-
Other ways:
WeChat Pay (微信支付:谢益辉) Alipay (支付宝:谢益辉) 

When sending money, please be sure to add a note “gift” or “donation” if possible, so it won’t be treated as my taxable income but a genuine gift. Needless to say, donation is completely voluntary and I appreciate any amount you can give.
Please feel free to email me if you prefer a different way to give. Thank you very much!
I’ll give back a significant portion of the donations to the open-source community and charities. For the record, I received about $30,000 in total (before tax) in 2024-25, and gave back about $15,000 (after tax).