matticus
Guru
Broadly, I'd say that's never the case: medical decisions will be 90%* based on knowledge like the nature of cells, how our circulatory system works, the role of bacteria. Stuff we have known for decades.But on the flip side I bet you appreciate that scientists and doctors tend to rely on the newest research to develop treatments, vaccines etc?
You don't throw away that knowledge and start again. Progress is even slower with road safety: We are still using cars and bikes on public tarmac roads, using rubber tyres. Human skulls haven't changed. Heck even the speed limits haven't changed very much since the 1960s.
If you have new/recent research to hand that utterly disproves statements on cyclehelmets.org , do please share with the class.
*For citation, please join the queue.