
Thijs de Buck, an MRI physicist based in the Netherlands, recently built a speed and distance tracker for his hamster Mollie’s wheel, with the data automatically uploaded to Mollie’s own Strava account. One recent activity showed 6.06 miles in 4 hours and 37 minutes. The next night, Mollie logged 5.55 miles in 3 hours and 56 minutes. At first, de Buck just wanted to know how much distance Mollie was covering after dark. “I bought a very cheap bicycle computer pretty much right away,” he told Runner’s World. But the sensor would shift into standby mode once Mollie stopped running for more than five minutes. The build itself is clever, but the basic idea is simple. As de Buck explains it, a magnet on the wheel passes a hall sensor, which detects each rotation. An ESP32—basically a tiny programmable computer—keeps track of the data overnight. In the morning, he says a script on his laptop collects the information, turns it into a Strava-compatible .FIT file, and uploads the activity through the Strava API. (via Runner’s World)
The Roman emperor Claudius invented three new letters but no one wanted to use them

During his tenure as Rome’s princeps, Claudius not only provided the empire with sanitation, medicine, education, wine, public order, irrigation, roads, a fresh water system, public health and peace, but also found time to reform the alphabet. The writing system, approaching two thousand years old in Claudius’ day, comprised twenty-one letters, pruned back to spell well the sounds of spoken Latin. It ran from A to X, with the Greekish letters Y and Z hovering on the margins. Literacy was flourishing; the alphabet had already percolated through Roman society, from senators and scholars to the scatological scribblers of Pompeii. Claudius thought, however, that there was room for improvement. Whatever the emperor’s motivations, later biographers, like Tacitus and Suetonius, include the detail that the emperor deliberately created new letters. The emperor’s biographers agree that Claudius created and promoted new letters; that there were three of them; and that the three didn’t last long after his death in 54 AD. (via Danny Bate)
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