I find the body fat measurement tech interesting: https://blog.aboutamazon.com/devices/a-better-measure-of-health https://blog.aboutamazon.com/devices/a-better-

I find the body fat measurement tech interesting: https://blog.aboutamazon.com/devices/a-better-measure-of-health https://blog.aboutamazon.com/devices/a-better-measure-of-hea... Basically you take some pictures of yourself and they build a 3D model, then use a neural network to analyze and predict bf%. They claim "is as accurate as methods a doctor would use" and "we tested accuracy using Dual-energy X-ray Absorptiometry (DXA)" but they're not saying exactly how accurate it is compared to DXA, so I suspect the number isn't great.