The claim that testosterone is declining is specious at best, as measurement techniques have vastly improved over time and it's also being measured in a lot more people. Rather than suggest people "look it up," please provide a reference. There is no massive surge in hypogonadal men, regardless of claims made by anti-aging clinics (i.e. people whose business is selling exogenous testosterone). If you're worried about your T level, because of extremely common symptoms, you'd be better served getting checked for sleep apnea.

I know you're being funny, but seriously, there's a huge difference between mild trauma and huge, 300+ pound men smashing into each other. (Mass * Velocity)^2 = your brain is mush. There has not been nearly enough research into this subject; the actual effects of the trauma, both over long and short-term periods of time. This information will help everyone, not just athletes. It just so happens athletes experience massive numbers of concussions; hopefully their sacrifices will help benefit anyone experiencing head-trauma issues.

No, no it isn't. Please don't pretend you know what science is if you can't follow a simple a definition which is plainly accessible. It's a rock, floating in space, which is slightly more remarkable than a grain of sand on a beach.