After President Trump claimed that "20 world-class mountain climbers" tested his border wall design and could not surmount it, retired engineer Rick Weber built a replica and has invited elite climbers to try for themselves.
Scientists studied the potential benefits of 18 different types of exercise.
Rick Allen was stranded for 36 hours before a drone spotted him and its pilot guided rescuers to the stricken climber.
An Australian climber also died while approaching the summit and a Slovakian climber perished in the so-called "death zone."
A Dutch man and an Australian woman died while descending from the summit.
Americans Alex Lowe and David Bridges were filming a documentary series for NBC Sports when the avalanche struck.
Search and rescue teams are still looking for a couple who disappeared over the weekend.
The avalanche occurred around noon local time on the Dome de Neige des Ecrins mountain.
The peak of the Mirror Wall is four times the height of the London Shard skyscraper.
"I climb because a mountain pulls you in. It draws you to it, just like a drug. It really is like an addiction."
The government vowed safety improvements after dozens die last year, but tour operators say the measures aren't enough.
Climbing veterans, trekking organizations, and government talk safety as casualties near the popular trail climb and dozens more are rescued