I'm more shocked that Kids can't tell the time on a normal clock.
I'm suprised at the teens who wear a watch but still can't tell the time.
They learn at primary and then forget, they all use their phones for time.
Re the unknown soldier and the DNA.
You need a sample to match it to, how do you find that?
Unknow, means
SORRY THIS WILL BE GRIM
means, in most cases nothing to identify, no face, number, partial uniform.
Then you have to have a close relative to give a sample to compare. These were young men, few had children and if they did, well the 'child' would be over 100 now.
So you would have to DNA test a huge number of people and still not get a match. And not just French people, France's borders moved a lot before WWII.
It's a bit different with someone like Richard III, you have known descendents and relatives. With the Romanovs there were also relatives and a blood sample from when Nicholas had been attacked in Japan.
I think the American one from Vietnam you would have family who had lost someone but who were still alive and better records of who they could be.