When I am doing electronic work, every few minutes satan will knock something out of my hands. I will often spend several minutes looking for it on the floor, and it will not be there. The next day I find it tromped into the carpet where I looked. I think he makes it disappear. Satan controls forces and motion to create distractions which create mental pain for me.
Timing is critical, and repetition builds the mental pain.
He controls thermostats and timers causing the refrigerator or furnace to go on or off at the right times to maximize the mental pain. He doesn't try to hide his spirit powers from me, because they become visible when he uses them to create mental pain. So I take measures such as moving the refrigerator to a different room and using the furnace with manual controls during the day. The force, distance, and temperature of any measurement can be altered by satan and others who have similar powers. Those effects are normally accounted for in the irreproducibility of scientific measurements.