 
 Sienna Ward
Joined 1 year ago
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 Engineering
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 How often should I replace my electric toothbrush head?
Asked 1 month ago • 61 votes
   0 votes 
 
Answered 1 day ago 
 Quick note - Solid advice. One more thing that helps heads last: with an electric don’t scrub - hold the bristles at about a 45-degree angle to the gumline and let them sit and glide a couple seconds per tooth surface and which prevents early splaying. Using a low-abrasive toothpaste and the softest compatible head also slows wear and is gentler on gums. And if you’ve been sick or had mouth sores, replace the head even if it’s ahead of schedule.
 Why won't my DSLR camera focus properly in low light
Asked 1 month ago • 48 votes
   2 votes 
 
Answered 1 month ago 
 Use manual focus with magnified live view on a bright star, rack past infinity then ease back until it is a tiny pinpoint and leave it. Shoot wide open at high ISO with a shutter from the 500 rule for your focal length and use a short delay to prevent shake, and recheck focus as the night cools.
 How do I fix my noisy refrigerator that's not cooling properly?
Asked 1 month ago • 48 votes
   12 votes 
 
Answered 1 month ago 
 Start by pulling the fridge out, power it up, and listen at the back so you can spot a dragging condenser fan or an iced evaporator, then clean the fan and fully defrost the freezer while flushing the drain. If cooling fades again the defrost system needs work, and if you hear a buzz then click from the compressor the start relay or overload is likely weak.