Some scientists argue that elephants are never submerged so deeply that water pressure on their lungs would be an issue, and that denser lung tissue in elephants may have developed for other reasons.
In our high-tech world it’s easy to forget the simpler things. Take a bicycle, for instance. No engine, no computerized braking system, no fancy fuel injection: all you need is air in the tires and off you go. Simple, that is, until you take a closer look at bicycles with multiple speeds. How do all [...]