Novel helmet liner made from carbon nanotubes

Yeah. How good are US military helmets good at absorbing impacts? I’d like to know how this compares to helmets that meet Snell SA2020, B-95, ECE 22.06, or other more widely used standards that people use widely.

Right, a concussion is caused by sudden acceleration of the skull relative to the brain. The acceleration is the result of momemtum transfer, not energy transfer, and momentum is always conserved. Therefore, to first order, the key factors should be the mass of the projectile, the speed of the projectile, and the combined mass of the skull+helmet.

Spreading the impulse over a slightly longer time with energy absorbers should help a little, but im skeptical of the size of the effect without making the helmet significantly larger. Given the comparison with military helmets, It sounds like this design might be more about bleeding energy from projectiles to prevent penetration, so the sports claims seem confusing.

Concussions don’t have a particularly objective diagnosis or a very clean phase transition between “concussion” and “not concussion”, they are more so continuous with a soft floor, and they do get progressively worse with vague intensity of injury. It’s not really until your brain starts bleeding and such that there are clear diagnostic signs and there are definite but more vague long term effects from lesser concussions.

Reducing kinetic energy is exactly the kind of metric you can take in absence of any others.

I remember buying a motorcycle helmet, and there are a couple different standards to protect your head, yet they are almost incompatible with each other. Maybe it is better now.

EDIT:

https://agvsport.com/blog/which-helmet-standard-is-the-best-...

Has anyone checked to make sure they're not just using the worst possible liners for US military helmets?

In Icelandic athletes translates to íþróttafólk which literally means sportspeople. So to me this sounds like an Icelander that doesn’t know good English. It’s probably a perfectly cromulent word though.

In comparison to "sportsperson", "athlete" has slightly more of a connotation of proficiency or seriousness. "sportsperson" more plainly means anyone engaging in sport.

Can also include motorcyclists/cyclists, which aren't necessarily considered "athletes". Maybe "recreational use" might had been more apt.

Really wondering if this can be combined and standardized through ECE 22.06/SNELL/MIPS. ECE is probably the best bet for testing something like this, SNELL is too strict in its testing experimentation.

I think this might apply to people who do a variety of activities that might not fit into traditional genres, like motorcycling, horseback riding, ATVs, skiing, skateboarding, scooter/cycle commuting, military/police, etc

There’s a lot of sportspeople who aren’t athletes. I average close to 20 hours of sportsing per week, but I am no athlete. An athlete is someone who competes for realzies, maybe even money.

You're right, it's awkward and takes you out of the story. They could have just said athletes.

Why do people consume articles instead of reading?

Not all of them are athletic.

Athleople?