Denver, Colorado is 5,276 feet above sea level, hence the nickname “Mile High City.” 

The altitude there has been credited and blamed for the effects it has on unaware or unprepared visitors from lower elevations. People feel the effects of lower air pressure and decreased oxygen when they arrive; the same goes for visiting athletes. 

Sure, they’re better conditioned than Joe or Jane Average, but they’re drawing more on the thin air in their competitive exertions. Many, if they’re honest, have stories to tell about needing rather quickly to find their second wind and taking a few days to acclimate enough that their performances don’t suffer.

Such teams as the Nuggets, Avalanche, Broncos, and Rockies actually employ marketing schemes to plant seeds doubt in visiting teams, amplifying the disadvantages posed to those athletes who are not properly altitude trained. For example, at Ball Arena, there is signage where visiting teams enter and exit noting the city’s altitude. The numbers 5,280 are printed right on the court, near each free-throw line. The video board during introductions welcomes the road team with an ominous warning about the difficulty in catching one’s breath. Then, there are large, hazard-orange-and-black placards on display (“Attention: Altitude Warning/Low Oxygen”).

In fact, the intimidating marketing is right there in the name ... "Empower Field" at "Mile High Stadium"!

In response, we often see oxygen tanks used on the visiting teams’ sidelines to help them try to catch their breath.

There is a whole school of athletic training based on high-altitude workouts. Olympic athletes routinely seek out facilities in Denver and Colorado Springs to boost their oxygen efficiency, and countless trainers and gyms simulate the effects with dedicated breathing equipment.

Jasen Bracy always wanted to play football, but retinal cancer he developed as a toddler took his eyesight by the time he was age 7. How could he play a fast-paced contact sport like football if he couldn't see?

This was the question before him. Yet young Jasen would not be dissauded. As he got older, he began calling around to different youth leagues to see if there were any teams that would take a chance on a kid who was sold out to following and relying on the guidance and direction of others to make his dreams come true. He found just such a team in the Modesto Raiders.

"The way he was on the phone, I just said, 'Come on we'll figure it out,'" coach David Nichols told CBS News.

Jasen started out as a running back, but soon advanced to ... wait for it ... quarterback!

"It's all memory," Jasen said. "It's all about having trust in the player, the receiver and the team. I have to trust them 100%.

Upworthy reports:

Bracy's teammates guide him into position on the field and his dad coaches him from the sidelines using a walkie-talkie that transmits to his helmet. "After the play starts, I may tell him, 'Hey, run to your right, let's get upfield,' or 'Watch out, somebody's coming to hit you,'" Bracy Sr. said.

All that trust, all that deep leaning into guidance and direction seems to have paid off. Not long after, Bracy led the Raiders to a 33-6 win.

In the past, only one piece of metal could be cut at a time with a saw or other metal cutting mechanical process. It took a lot of time and was expensive. Then came the invention and use of waterjets.

Low pressure waterjets were first used for mining gold in California in 1852. Steam and hot water jets were used in the early 1900s for cleaning. High pressure waterjets were used for mining in the 1960s. During the mid 2000s waterjets started to be used for cutting. 

A waterjet is a tool used to cut with a (very) high pressure stream of water. Think of a waterjet as something with about 30 times the pressure of the power washer wand at our local car wash. Power washing at car washes is an example of a dirt film being “cut” off the body, wheels, and tires of our vehicles. The key to cutting metal with water is to keep the spray coherent. Waterjets are able to cut because the spray is channeled through a very narrow jeweled nozzle as a very high pressure to keep the spray coherent. 

Waterjets can cut marble, granite, stone, metal, plastic, wood, and stainless steel. They can cut a sandwich of different materials up to four inches thick. 

Unlike metal cutters, a waterjet never gets dull and it cannot overheat.