What really separates diesel engines from gasoline engines? Join Dr. Roger Billings as he breaks down the science behind engine compression—and explains why diesel engines don’t need spark plugs at all. By comparing how gasoline and diesel engines compress air and how that heat ignites fuel, you’ll see how one key difference leads to two very different ways engines create power. Discover what’s really happening inside your engine every time you turn the key. 🎥 Watch the full Science LIVE episod