Plenty of talk again about drug taking with regard to the leaders of the TDF. Froome has had it mentioned to him and I am not going to say he is not on some P.E.D. but Sky has a policy of making certain that their team is not "Drug" enhanced. I believe them but as I am British-I am bound to.
Brailsford has stated for years that improvements can be made by looking at the "Science" of cycling. Cutting drag- looking at riders and exploiting their good points- improving the poor ones with better training and even down to the clothing that is worn.
The article below is on BBC online news this morning so you can see some of the science behind the marginal improvements that can be made and how they can have an effect on winning or losing.