What are the safety precautions for using the HP ProBook 650 G1 on my lap?

Do not place the computer directly on your lap or obstruct the computer air vents to reduce the possibility of heat-related injuries or overheating. Use the computer only on a hard, flat surface, and do not allow soft surfaces such as pillows, rugs, or clothing to block airflow. The AC adapter should also not contact skin or soft surfaces during operation, as both the computer and AC adapter comply with IEC 60950 user-accessible surface temperature limits. (Page 3)