1:42 -> At low temperatures chemical reactions slow down! Well that is not entirely true,not true at all while the phrase may apply to the electrolytic reactions occurring in the battery, that are endothermic some reactions are exothermic which means that they accelerate under low temperatures.
Careful with the battery hack ! Yes low temp will slow down reaction (or lower the resistance) but you will have a cold surface on which water will condense and shortcut the battery !!
I love this channel so much and your English is charming! I have used the scrubber on the carrot hack for years and it works great on potatoes as well...you have to buy the coiled type shown,and it won't leave metal pieces in them..