So many varied things. It’s also much more useful on the phone so you can ask for things on the spot. Also 3.5 isn’t going to cut it, 4o is an order of magnitude better.
Just going through the recent history- proper use of plant sterols, identifying a weird bulb from a pic so I could order a replacement, a question (with a solution!) about lead outs in fusion 360, surface area calculation for an object from a picture, an estimate of all US professional athlete numbers, how to grow lilacs, questions related to radio wave propagation through different mediums, a thorough explanation of NEMA electrical outlets etc. This is just a selection of some over the last day or so.