some interesting and useful factoids i've gleaned from the inundation of mcat passages

• to most efficiently use the AC system after your car has been trapping hot air from the sun is to first use outside air until the car is cool. then switch to recycled air so that the car can use the internal air that is already cool.
  
• AM radio and FM radio differ in that AM radio waves transmit signals through amplitude differences while FM radio waves transmit signals by altering frequency. AM radio waves also have a wider range. tightttt. and get it? A=amplitude, F=frequency.
  

maybe everyone knew this already and i'm just slow... but at least i'm learning.