Laptops on laps? Bad idea Laptops on laps while charging? EVEN WORSE. When your body is in close contact with a charging laptop, it exposes you to high AC electric fields, a type of nnEMF (apart from the RF from WiFi & Bluetooth antenna) Not charging → 0 V/m While charging → 801 V/m Building Biology guidelines consider anything over 50 V/m a serious concern, I measured over 800 V/m here A grounded 3-prong plug could fix it, but apple has decided to ditch it in newer Mac chargers