Since March 2000, CriticalMAS has been a one-man operation. Across the website, you will see links to products or services discussed in blog posts. Many of these products are affiliate links that help me earn money to pay for this site.

Support my other website It is a site dedicated to coffee education, which has been online since April 1999.


I am a big fan of Udemy and have purchased several courses. I found the quality to be higher than Lynda (now LinkedIn Learning) or Pluralsight. With Udemy you can reach out to the instructor with questions.

Use my Udemy link if you want to purchase a class. They often run sales where the price is below $15, so if you see a high price, monitor the site and wait for a sale. The sales happen about once a month. Considering the depth of content it is a total bargain.

PayPal or BitCoin Donations

If you’d like to contribute to CriticalMAS with a small PayPal donation, that would be awesome!

I also have a BitCoin wallet.



iTalkiĀ Language Learning

$10 credit for you (and me) when you schedule your first language lesson. Sign up now even if you aren’t ready to schedule. They have great newsletters to help you learn a foreign language.


We both get travel credit when you sign up for an account with Airbnb using this referral link.

Affiliate Disclosure: All the programs listed on this page are affiliate relationships. I get a small amount of referral income when visitors click on the links and complete a purchase. This disclosure extends to all Amazon product links found throughout this website.