Abstract: The present disclosure relates to a razor cartridge including a housing having a front edge and a rear edge; at least one razor blade disposed between the front edge and the rear edge; and a mechanochromic layer disposed on the at least one razor blade, wherein the mechanochromic layer comprises a mechanochromic material.

Abstract: The present disclosure relates to a computer-implemented method for monitoring hand movements of a writing instrument's user, comprising: providing an electromyography sensor on the user's wrist or hand; monitoring hand movements of the user during a writing session with the writing instrument by reading sensors of the writing instrument; monitoring hand muscle activity of the user during the writing session by reading the electromyography sensor; correlating hand motion data and hand muscle data obtained from the monitoring; evaluating the correlated data and classifying the hand movements as normal or abnormal based on at least one of tremor parameters, hypokinetic parameters, and historical data of the user; and providing an indication in case of an abnormal evaluation.