Lelièvre, Claude <br/><br/>
Areas of friction 

 -  2024.<br/>							 
<br/><br/> 25 
<br/><br/> In the nineteenth century, the long summer break enabled high-school students from noble families to take part in the rites of passage related to hunting. In the twentieth century, winter tourism imposed its demands on chronobiologists, who are still struggling to make their recommendations heard.