my dog is barking almost ever night at my back door i find wierd things out of place like foot prints in my garden and wet marks on my porch shaped like feet and my screens on windows that are easy to climb in if the window was unlocked up and dirt marks shaped like fingers on my back door should i invest in a security system
Something with rest mass. Otherwise it would be energy, however mass and energy are interchangeable, and we've known that since Einstein gave us his little famous equation about a century ago. Matter is something that distorts spacetime. Like bowling balls on a rubber sheet - everything has a gravitational field - even tiny things have their own gravity. I'm not sure a comprehensive answer is possible without contrasting it to things which aren't matter, I hope that doesn't make it circular. pedia defines it as what physical objects are made of which seems really to be just a rewording of 'the opposite of intangible vacuum and energy' well not quite the opposite - negative energy is something very different. You know what I mean. Physics is the best place for this question. Philosophers haven't had a place in real science for about 400 years.
move the alarms away from bathrooms. the steam from the shower will set them off.
I needs a new battery; the beep is to let you know the battery is getting low. They'll usually beep about once per minute. Are you SURE that it's not battery powered??? I've never heard of a hard-wired one that beeps. I'd take the cover off and check, just to be sure. If you are CERTAIN (after actually, personally checking) that it's not battery powered, you might want to be sure it's actually getting power. If it is, then try using some compressed air (like the kind you get to get gunk out of a computer) to blow into it and clean it out. But most smoke detectors take an ordinary 9-volt battery. If none of that works I'm still guessing it's NOT getting power through the wiring, and it's beeping to let you know; that will be something the apartment maintenance people will have to do, presumably. Until then cover it with something (??) somehow, and do your best to ignore it. Good luck.
