Worst martial art or self-defense? Which of these is the worst and completely useless in self-defense in an emergency on the street and more of a show?

Which is the worst martial art or self-defense and is not applicable in an emergency in a self-defense situation on the street and is therefore completely unsuitable? So, the martial arts self-defense that doesn't achieve anything and is totally useless compared to others? The worst of all. When escape is no longer an option and…

Multiple cleaning programs on a Philips Sonicare sonic toothbrush?

Hello . Who owns a Philips Sonicare sonic toothbrush and can tell me their personal opinion about the cleaning programs? Some models have two or even five different cleaning programs, such as Clean, White+, Gum Health, and Deep Clean+. For example, the HX 9601, HX 9914, and HX9911. Are these truly different and effective cleaning…