We are all familiar with fans. They move air, which in turn help bring in fresh air and improve our own human cooling system through sweat. My favorite fans are from Dyson, with the desktop AM06 being my favorite all-purpose general fan. It has every feature you’d want in a desktop fan, and I have not found a better general all purpose desktop fan. Dyson makes a bunch of other fans too, they are all just variations with some additional features, but often times adding significantly to the cost.
When I’m sitting in front of my laptop, my favorite USB fan is this one by OPolar. Its quiet, efficient, and runs off of USB power, with decent features. No oscillation though, and its really only good for personal use.