1 Plant/Animal Cell Model (interactive) 2  Pumping Heart Cells. 3  Apoptosis (video) 4  Cell Cycle (interactive) 5  Mitosis (interactive) 6  Meiosis (interactive)  Microscopy.
Amtrakâs Acela Express is currently the fastest train in the US, capable of a maximum speed of 150 mph (241 km/h) â although it typically travels at about half that speed. Depending on whose definition you go by, that may or may not qualify it as a high-speed train. Source: State of California (PDF) via Inhabitat.
Until the project is complete, American rail travelers will have to settle for Acela trains, which hit 150 mph. While impressive compared to highway speeds, that's nothing next to what real high speed rail can do. Among the fastest in the world, these trains regularly top 200 mph and even crack the 300 mph mark. See the world's fastest trains Â».