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Michael Nielsen and Andy Matuschak wrote Quantum Country (https://quantum.country/), an introduction to quantum mechanics, with integrated spaced repetition questions. Andy develops Orbit (https://withorbit.com/), allowing other authors to do the same.

I agree with Michael that a lot of the value comes from formulating your own questions based on the source material, but I'm also curious to experiment with author provided questions.

I started with Dr. Davis' recipe. It's described in his book "Super Gut" and is also available on his website [1]. My current method is a bit simpler:

- I buy full fat milk in a glass bottle so that I can make the yogurt directly inside without having to sterilize another container. I have had more success with UHT milk than pasteurized milk.

- I add two tbsp. (~40g) of my previous batch to one liter of milk. Close lid and shake.

- Put bottle in a pot of water, submerging most of the milk bottle. I leave the lid on, but untightened so that gas can escape.

- I add a sous vide "wand" to the pot and leave it for 24 hours at 38°C (100°F)

I deviate from Dr. Davis' recipe by not adding inulin to the milk and fermenting for a shorter duration. This probably results in fewer bacteria present in the final product, but the above takes me less than 5 minutes to prepare.

[1] https://blog.undoctored.com/lreuteriyogurtstepbystep/

+1 on making the yogurt. I have been making L. reuteri yogurt (or fermented milk, technically) for a few months. I started with some BioGaia Gastrus tablets in batch 1 and now just use a tablespoon or two of batch n - 1.

I recommend getting a sous vide device for precise temperature control. Initially, I used a the "Yogurt" function on an Instant Pot pressure cooker and about half of the batches failed, separating into whey and curds.

Sunlight is one of the most powerful zeitgebers and it makes sense to try and optimize the amount of sunlight exposure. However, is there a difference between morning light and evening light in terms of how they entrain the circadian rhythm?

If I work from 9am to 5pm in a dark office building, permanent standard time might allow me an hour of sunshine before work from 8am to 9am, and permanent DST might have me arriving in work while it's still dark but allow me an hour of sunshine from 5pm to 6pm. Which of those light exposure patterns would allow me to wake up easier at 7.30am?