Perhaps the BEST B1G Forum anywhere, here at College Football Fan Site, CFB51!!!

https://www.atlasobscura.com/places/bridge-nowhere-san-gabriel-mountains
https://modernhiker.com/hike/hiking-the-east-fork-of-san-gabriel-river-to-the-bridge-to-nowhere/

I did the hike with a buddy in 2016. Nice hike w/o being overly challenging. The multiple stream crossings were annoying though. The first one we decided to take our shoes off and then put them on on the other side. After that we said screw it and just hiked with wet shoes. It was hot and dry enough that while it wasn't "pleasant" to hike like that, it was less annoying. And it's only 10 miles total, so it wasn't THAT bad.

When I did AT section hikes (which I'll get back to someday) we carried water shoes for stream crossings because wet socks/boots can easily lead to blisters and the alternative of crossing in bare feet can lead to even bigger problems if there are unseen sharp edges underwater.  

I'd rather hike over the bridge

Why would that baffle them? 

If it's even and you divide by 2, and it's even again, you divide by 2 again, and if it's even again, divide by 2 again, etc. This means that every even number that results in an even number after divided by 2 will be divided by at least 4, and possibly 8, and possibly higher powers of 2. 

If it's odd and you multiple by three and add 1, the result will ALWAYS be even. So while it may intuitively seem like you're always making numbers larger when they're odd, it's much less than thought. Because the immediate result will be the equivalent of multiplying by ~1.5, not 3, because the next number will ALWAYS be divided by 2. 

So it's simple. Starting with:

• 1. Multiply by 3, add one=4. Divide by 2=2. Divide by 2 again=1.
• 2. Divide by 2=1.
• 3. Multiply by 3, add one=10. Divide by 2=5. x3+1=16. /2=8. /2=4. /2=2. /2=1. 
• Jump to, say, 17. x3+1=52. /2=26. /2=13. x3+1=40. /2=20. /2=10. /2=5. (Devolves to starting with 3 above, which gets you back to 1). 

This seems simple as hell. I didn't spend more than a few minutes thinking about it and I can see how the division of evens will always outcompete the multiplication of odds. 

Ahh, got it. So they all understand it, but nobody has been able to concoct a formal mathematical proof.

That makes more sense than mathematicians being "baffled" by this 

THIS DAY IN HISTORY: 

The Los Alfaques Disaster (1978)
The Los Alfaques disaster was an explosion that took place near a campsite in Tarragona, Spain, when a leaking tanker truck loaded with 23 tons of highly flammable liquid propylene ignited. This resulted in a massive explosion and fireball that reached over 1000° F (538° C) and destroyed everything within a 1000-ft (300-m) radius. It killed 217 people, including the truck's driver, and severely burned more than 200.

This Day In History July 7 1928 Sliced bread sold for the first time by the Chillicothe Baking Company, Missouri, using a machine invented by Otto Frederick Rohwedder. Described as the greatest forward step in the baking industry since bread was wrapped.
By 1933, around 80% of bread sold in the US was pre-sliced, leading to the popular idiom "greatest thing since sliced bread".