Journeys 3.1

The outside temperature this morning was -18°F, meaning another day indoors. Made use of the exercise room and daydreamed about our upcoming six-week trip to a warmer climate. Our large deionized water tank won’t be enough, so I connected a second tank–usually reserved for outdoor plants on the balcony–to our system. A pump transfers water from the smaller tank to the larger one.

It was a day for isolating ourselves from the world: the weather was still too frigid to go outside, plus we declared a no-news day. I prototyped a LEGO pneumatic AND gate that functions significantly better than the gates I built yesterday. However, I won’t be building a pneumatic adder any time soon because I don’t have enough pistons.

All logic functions can be constructed using AND and NOT logic gates. Modern smartphones contain billions of logic gates. However, the LEGO machine I constructed today only has four AND and four NOT gates to perform binary addition on two single-bit binary numbers. As the signal propagates from the inputs on the left to the outputs on the right, the cumulative effect of joint play leads to unreliable output movements. I need to redesign the machine.

Drove from heated garage to heated garage for a Minnesota Orchestra concert of music by Nordic composers. There were nods to hygge, which was fitting with temperatures staying in negative territory for a few days. We’re not leaving our building again until Wednesday.

It was almost balmy weather for January in Minnesota (in the thirties) as I walked to the University for a consultation and medication top-ups (injections). With temperatures expected to drop below zero for the next few days, I’m anticipating a period of hibernation. This appointment was therefore well timed.

Over tonkotsu ramen, Dwight and I compared notes about our day–he in the greenhouse, me in the classroom. I showed him photos of a sad-looking plant in the classroom. He suspected overwatering and advised deionized water would be better than tap. He also suggested the plant needed to climb and might benefit from fertilizer after its dormant period. I’d previously used Google Lens on the plant, and it had led to similar advice.

Walked over to the Guthrie to see The Heart Sellers, a play that plays on the title of the 1965 Hart-Celler Act. This landmark legislation opened up immigration to non-Europeans and gave priority to immigrants with STEM skills. In the bittersweet play, set on Thanksgiving 1973, two immigrant women, one Filipino and the other Korean, yearn for a sense of belonging.